Prev Page--Species Description, continued || Next Page--Localities, References
Description of Species, continued
Gastropoda
Family Bellerophontidae
Genus BELLEROPHON Montfort.
Bellerophon stevensianus McChesney.
(Pl. XIII, figs. 7-7a.)
1860. Bellerophon stevensianus. McChesney, Desc. New. Pal. Foss., p. 61.
1865. Bellerophon stevensianus. McChesney, Ill. New Spec. Foss., pl. 2, figs. 18a-c.
1868. Bellerophon stevensianus. McChesney, Trans. Chicago Acad. Sci., vol. 1, p, 46, pl. 2, figs. 18a-c.
Shell small, subglobose, convolute, with only the last whorl visible. Volutions sublunate in outline, deeply impressed on the inner side. Aperture not expanded, interrupted on the outer lip by a fairly deep V-shaped slit; inner lip reflected at the sides. Umbilicus entirely closed. Surface marked by lines of growth which are strengthened to heavy wrinkles near the slit band, but become fine lines on the sides of the volution; lines broadly arched forward on the sides, bending backward into the slit band on the periphery. Slit band narrow, peripheral, slightly raised and Battened on top, margined on each side by a sharp, shallow, depressed line. Dimensions of two specimens: Breadth, 5 mm., 18 mm.; diameter, 6 mm., 20 mm.
This species differs from B. Crassus in its smaller size, closed umbilicus, and in the nature of the slit band.
Horizon and locality. Drum limestone, oolitic member, at Turner, Muncie and Cherryvale (station 40), Kan.
Genus PATELLOSTIUM Waagen.
Patellostium marcouianum (Geinitz).
(Pl. XIII, figs. 9-9a.)
1866. Bellerophon marcouianus. Geinitz, Carb. und Dyas in Neb., p. 7, tab. 1, fig. 12.
1872. Bellerophon marcouianus. Meek, U. S. Geol. Surv. Neb., p. 226, pl, 4, fig. 17; pl. II, figs. 13a-b.
Shell of medium size, convolute, volutions increasing rapidly in size, lip greatly expanded. Aperture subcircular, the lip flaring out in front and reflected in the rear so as to extend well beyond the apex of the shell; slit, as indicated by lines of growth, narrow, shallow, and V-shaped. Umbilicus deep and rather wide. Slit band a strong, raised median ridge margined on each side by a deep angular sulcus. Surface marked with fine, numerous, closely spaced longitudinal lines; crossed by obscure lines of growth which are arched forward from the umbilicus to a point near the slit band, where they are curved gently backward. On the flare, two weak concentric wrinkles are observed. Dimensions: Lip, 40 to 43 mm. in diameter; height of shell, 18 mm.
This shell differs from the shell figured by Geinitz in that the slit band is not so abruptly raised nor so roughened by growth lines. Meek states, however, that the shell figured by Geinitz shows these characters to an unusually marked degree, the majority of the representatives of the species being less strongly marked. It is probably the same species or a very closely related form. It is distinguished from other species of the genus by its surface ornamentation and by the strong median ridge, which is also marked by fine longitudinal striae.
Horizon and locality. Drum limestone, oolitic member, at Muncie and Independence (station 23), Kan.; and Kansas City, Mo.
Genus BUCANOPSIS Ulrich.
Bucanopsis tenuilineata (Gurley).
(Pl. XIII, figs. 6-6a.)
1884. Bellerophon tenuilineatus. Gurley, New Carb. Foss., Bull. No. 2, p. 10.
1899. Bucanopsis tenuilineata. Girty, 19th Ann. Rep. U. S. Geol. Surv., pt. 3, p. 69l.
Shell under medium size, subglobose, convolute, the body whorl moderately expanding. Aperture with a broad notch, marking the position of the slit, sublunate in outline; inner lip reflected and forming a thick, smooth callus over the preceding volution; sides reflected and thickened, forming a nearly horizontal plate which is slightly curved with the curve of the shell. Umbilicus broad and deep. Slit band broad, not raised above the general surface of the shell, and margined on each side by a strong, heavy, longitudinal line. Entire surface ornamented with numerous fine, closely set longitudinal lines, separated by furrows of equal width, and increasing by implantation, those on the slit band being a little stronger than the rest. These are crossed by regularly arranged, rather faint lines of growth, which pass forward from the umbilical region and thence curve gently backward when near the slit band. Dimensions: Transverse diameter, 17 mm.; longitudinal diameter, about 17 mm.
This species is distinguished by its flat slit band and the regular longitudinal striae, which are much stronger than the transverse striae.
Horizon and locality. Drum limestone, shale member at Turner, Cherryvale (station 40) and Independence (stations 9, 22), Kan.
Bucanopsis textiliformis (Gurley).
(Pl. XIII, figs. 4-5.)
1883. Bellerophon textiliiormis, Gurley, New Carb. Foss., Bull. No. 1, p, 6.
Shell rather small, subglobose, convolute; volutions expanding rather rapidly. Aperture sublunate; outer lip cut medially by a narrow, deep slit extending about 3.5 mm.; lip extending forward in the curve of the shell, but not flaring; sides reflected and thickened; inner lip reflected and forming a thick, smooth deposit over the preceding volution. Umbilicus narrow and deep. Surface marked medially by a slightly raised slit band which is margined on each side by a narrow angular sulcus; lines of growth of varying strength, but generally pronounced, with every third or fourth one stronger than the others, and generally less prominent on the slit band than on the shell. Crossing these, and separated by about three times their width, are strong, longitudinal lines which give the shell a beautiful cancellated appearance. Dimensions: Width, 17.5 mm.; diameter, 17.8 mm.
These specimens compare favorably with Gurley's type and come from the same locality and horizon. It seems probable that B. bellus Keyes should be referred to this species. It comes from the same locality. No differences of specific value are observed in his figure, and he cites none in his description.
Horizon and locality. Drum limestone, oolitic member, at Turner and Muncie, Kan., and Kansas City, Mo.
Family Pleurotomaridae
Genus PLEUROTOMARIA Sowerby.
Pleurotomaria granulostriata Meek & Worthen ?
(Pl. XIV, figs. 2-28.)
1860. Pleurotomaria granulostriata. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p. 459.
1866. Pleurotomaria granulostriata. Meek and Worthen, Geol. Surv., Ill., vol. 2, p, 356, pl. 28, figs. 2 a-d.
Shell very small, conical sub ovate; spire moderately elevated. Volutions five or six, flattened or slightly convex, and subparallel to the slope of the spire on the upper side of the volution, narrowly rounded or subangular at about the middle, and somewhat convex on the lower side. Suture well defined. Aperture sub circular, flattened on the top, and oblique; inner lip not reflected; outer lip rather deeply slit at about the middle. Slit band situated on the subangular carina near the middle of the volution on the last whorl, and passing around just above the suture on the others; narrow, and defined by small ridges on each side. Axis imperforate. Surface ornamented by about twelve spiral lines, of which there are four on the upper surface; crossed by numerous transverse lines, which, in crossing the spiral lines, particularly on the upper surface, give them the appearance of rows of small nodes. Length, 7 mm.; breadth, 4.5 mm.; apical angle about 53 degrees.
This shell is somewhat larger than P. granulostriata Meek and Worthen; the apical angle is smaller by seven degrees; and the shape of the volutions is different, being distinctly subangular about the middle. No trace of a revolving line is found on the middle of the slit band, as his description would indicate. On the other hand, since the surface ornamentation is identical, with these exceptions, and the one specimen in the collections is more or less coated with calcium carbonate, which somewhat obscures the surface, the material at hand is considered insufficient to permit differentiation.
Horizon and locality. Drum limestone, oolitic member, Turner, Kan.
Pleurotomaria beckwithana McChesney.
(Pl. XV, figs. 1-1b.)
1860. Pleurotomaria beckwithana. McChesney, Desc. New. Pal. Foss., p. 61.
1865. Pleurotomaria beckwithana. McChesney, Ill. New Spec. Foss., pl. 2, figs. 17 a-b.
1868. Pleurotomaria beckwithana. McChesney, Trans. Chic. Acad. Sci., vol, 1, p, 47, pl. 2, figs. 17 a-c.
Shell small, low-spired, subglobose, composed of about four volutions, of which the last equals about two-thirds the entire height of the shell. Volutions subovate in outline and increasing rapidly in size. Suture linear, and deep, the upper portion of the lower volution rising somewhat above the suture line. Aperture subcircular; outer lip thin, with a rather deep slit in the middle; lower lip slightly deflected on the inner side; inner lip reflected so as to partially close the broad, deep umbilicus. Surface with nine low, broad, revolving lines separated by narrow striae above the slit band, which is slightly depressed, and eighteen below it. This number seems to remain constant with growth while the separating striae become successively broader. Crossing these are numerous fine lines of growth which curve backward from the suture to the slit band, and then forward again, and curve gently into the umbilicus. On the later portions of the shell these lines of growth are sometimes gathered into wrinkles near the suture. Slit band situated at about the middle of the volution, and plainly visible on the last whorl, but partially hidden in the earlier volutions due to the depth of the suture. Dimensions: Height, 4 mm.; diameter, 5 mm.
Typical specimens of P. beckwithana are much larger than the present forms, and the spiral lines are larger and better marked. In general form and outline, and in the number of lirae on the volutions, they are the same. It may be worthy of note that McChesney's figures show the transverse wrinkles near the suture larger and more prominent than those observed in this collection.
Horizon and locality. Drum limestone, oolitic member, at Muncie and Independence (station 23), Kan.
Pleurotomaria subconstricta Meek and Worthen.
(Pl. XIV, figs. 4-4a.)
1860. Pleurotomaria subconstricta. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p. 458.
1866. Pleurotomaria subconstricta; Meek and Worthen, Geol. Surv. Ill., vol. 2, p. 351, pl. 28, figs. 6-6a.
Shell small, conical, somewhat turreted, the last whorl equaling about half the height of the shell. Volutions five to six, thickened near the suture into a subangular prominence which is occupied by a series of small nodes; shell obliquely flattened or slightly concave below this. Most prominent part of the volution about the middle, which bears two carinae separated by a vertical, flattened, or concave portion of the shell, with the upper carina more pronounced. Base slightly convex. Whorls so aligned that only the upper carina shows at about the middle of the upper volutions. Suture linear. Aperture broad, subovate to subcircular, inner lip thickened but not reflected. Shell imperforate. Slit band narrow, flat, and situated just above the middle angle, bounded on each side by a fine spiral line. Surface of the shell ornamented by about fifteen or more spiral lirae, of which there are twelve on the lower side, where they are larger than above; crossing all these lines are fine, closely arranged lines of growth. Length, 11 mm.; diameter, 7.5 mm.; apical angle 65 degrees.
This shell is a little larger than specimens observed from the type locality of the species. It lacks the row of small nodes on the second angle of the body whorl as shown in Meek and Worthen's figures, but not mentioned in their description. Otherwise it is identical.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (sation 12), Kan.
Pleurotomaria subsinuata Meek and Worthen.
(Pl. XIV, figs. 3-3b.)
1860. Pleurotomaria subsinuata. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p, 460.
1866. Pleurotomaria subsinuata. Meek and Worthen, Geol. Surv. Ill., vol. 2, p. 358, pl. 28, figs. 4 a-d.
Meek and Worthen's description: "Shell under medium size, conical-ovate; spire rather elevated; volutions six, convex, last one in mature shells sometimes obliquely flattened a little above, just below the suture, thence rounded below. Suture well defined; spiral band narrow, prominent angular, located above the middle of the body whorl, at the lower edge of the slight flattening of its upper side, and passing around the middle of the upper turns; sinus of the lip shallow, judging from the slight curve of the lines of growth; aperture nearly circular; columella not distinctly perforated. Surface ornamented by about fifteen distinct revolving lines, some three or four of which on the middle are larger than those above, while those below gradually diminish in size towards the small umbilical impression; only two or three of the smaller lines usually occupy the slightly depressed portion of the whorls above the spiral band, where they are crossed obliquely by a series of regularly arranged wrinkles; lines of growth extremely fine and very obscure. Length of the largest specimen, 0.40 inch; breadth, 0.31 inch; apical angle convex, divergence, 55 degrees.
"The spiral band of this species is so little apparent that we were at first in doubt as to whether it really belongs to the genus Pleurotomaria. On examining carefully, however, by the aid of a lens, the obscure lines of growth, we observe that they make a small but distinct backward curve in crossing the upper of the three or four larger revolving lines passing around the middle of the body whorl, so as to indicate the presence of a shallow sinus in the lip at the termination of this revolving line. The band of the sinus being angular or carinated, and scarcely larger than the other revolving lines, would not be distinguished from them where the surface has been a little weathered so as to obliterate the obscure striae of growth. The surface markings will at once distinguish this shell from any of its associates, and we know of no foreign forms with which it is likely to be confounded."
Two specimens of this species were found at Kansas City, Mo. They are a little smaller than Meek and Worthen's shell (height, 7 mm.; diameter, 5 mm.; divergence, 58 degrees); they have only five volutions, and the lines of growth form small nodes on the spiral lines above, but are otherwise identical with shells from the type locality.
Horizon and locality. Drum limestone, oolitic member, at Kansas City, Mo.
Pleurotomaria bilineata Sayre, n. sp.
(Pl. XIII, fig. 13.)
Shell rather small, high-spired and turreted. The dimensions of one individual which has only a portion of the apex broken off are: Height, about 17 mm.; diameter, 12 mm.; apical angle, about 45 to 50 degrees. Volutions four, with at least the first two, and possibly three, broken off; quadrangular, subovate or angular in outline on the outer side, and rounded on the inner, the last volution equaling about half the height of the spire. The volution bears three angles, one next to the suture, a second very prominent peripheral angle or carina about one-third of the way down, and a third angle about two-thirds of the way down, which is not so prominent and less angular than the second. Between the first and second angles the surface is obliquely flattened or concave; between the second and third the surface is concave and slopes slightly inward toward the bottom. Base quite convex; axis imperforate. Aperture subcircular, with the inner lip slightly reflected. Surface smooth except for the lines of growth which pass obliquely backward from the suture, and are rather narrowly recurved above the carina, and thence pass forward across the carina and pass almost radially to the center, becoming more pronounced on the lower surface. Below the third angle there are two broad, obscure spiral ridges. The shell is so aligned that the third carina is almost hidden on the upper volutions.
This shell differs from both P. inornata and P. perhumerosa in having the third angle, and a more or less constricted spiral band about the shell, between the second and third angles. The slit band is broad and poorly defined. Its apical angle is smaller than that of P. perhumerosa and larger than in P. inornata. In the position of the slit band and its constricted spiral band, this species resembles P. subconstricta, but is almost entirely lacking in ornamentation, and is a larger shell.
Horizon and locality. Drum limestone, two specimens from the oolitic member at Kansas City, Mo.
Pleurotomaria fisheri Sayre, n. sp.
(Pl. XIII, figs 10-10b.)
Shell small, spirally coiled, somewhat turreted. The dimensions of a rather large individual are: Height, 4.5 mm.; diameter, 4.5 mm.; apical angle, about 83 degrees. Volutions four to five, angular, enlarging rather rapidly, the last one equaling nearly half the entire height. Shell angular near the suture, 'upper surface of the volutions obliquely flattened or slightly concave; carina sharp, angular, and about one-fourth of the distance down; below this the surface is vertical, slightly concave or rather depressed, and nearly flat to about one-fourth the distance from the bottom, where it is abruptly rounded, almost angularly into the base, which is convex, and rounds into a rather large and deep umbilicus. Volutions subquadrate, rounded on the inner .side. Aperture subquadrate in section. Slit apparently not deep and situated just above the carina which forms the lower boundary. Slit band prominent, situated above the carina; bounded on the lower side by the ridge of the carina, and on the upper by a sharp linear ridge. Suture linear and well marked. Volutions aligned so that the top of the succeeding volution falls on the lower edge of the perpendicular peripheral surface of the preceding one. Surface marked by about twelve spiral lines, of which four are on the upper surface and the remainder on the lower surface, the nearly perpendicular :peripheral surface being smooth except for one spiral line near the lower edge.
P. gurleyi is the only species in the Pennsylvanian which resembles this form. It differs from that species in the height of the spire, and in having the peripheral surface narrower and marked by one spiral line, in its more convex base, larger umbilicus, and in the ornamentation of the upper surface of the volution, which, in this species, is marked by four strong spiral lines.
Horizon and locality. Drum limestone, oolitic member, at Turner, Cherryyale (station 40) and Independence (station 23), Kan.
Pleurotomaria kansasensis Sayre, n. sp.
(Pl. XIV, figs. 1-1a.)
Shell small, low-spired, width greater than height. Volutions about five, elongate oval in outline, increasing rapidly in size, the last one equaling about two-thirds the height of the shell. Shell thickened and strongly subangular below the suture, and bearing a row of nodes; flat or slightly concave below this, and thence rounding rapidly into the sides, which are nearly flat and vertical; base flattened. Aperture oblique, sublunate in outline; inner lip apparently not reflected. Umbilicus, if present, closed by a thick callus. Slit band narrow and poorly demarked, its presence being indicated only by the strongly bent lines of growth. Suture narrow and deep. Surface smooth except for the row of nodes below the suture, and numerous very fine lines of growth which extend obliquely backward from the suture to the slit band, where they are strongly recurved, indicating that the slit was fairly deep, arched forward on the sides and bending backward again to cross. the base. Dimensions: Height, 7 mm.; diameter, 8.5 mm.; apical angle variable, generally about 115 degrees.
This shell is characterized by its low spire, the row of nodes below the suture, the vertical sides, smooth surface; and the large callus on the base. So far as the writer is aware, there is no species with which it can be confused.
Horizon and locality. Drum limestone, oolitic member, at Muncie, Kan.
Genus PTYCHOMPHALUS Agassiz.
Ptychomphalus laudenslageri Sayre, n. sp.
(Pl. XV, figs. 4-4a.)
Shell small, conical, height greater than width; composed of seven or eight volutions, expanding rather gradually, the last one equaling about one-third the height of the shell. Volutions flattened on the upper surface and nearly parallel to the slope of the spire, but with the lower margin of the preceding volutions projecting slightly beyond the upper margin of the next. Peripheral portion strongly subangular; base flattened. Aperture oblique, quadrangular, with nearly equal width and breadth, broken by a deep slit, which extends about one-third the circumference of the shell, and is situated about its width above the angular periphery. Slit band narrow, concave and bounded on each side by a narrow spiral line, which is the only spiral ornamentation of the shell. Umbilicus closed. Suture well marked. Lines of growth regular, fine, rather crowded, and gathered into small transverse wrinkles on the upper portion of the volution. Dimensions: Height, 6.5 mm.; diameter, 4 mm.; apical angle, about 37 degrees.
This species differs from P. coniformis Meek and Worthen in its greater height, smaller apical angle, and in lacking the spiral lines on the bottom of the shell.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (stations 12, 23), Kan.
Ptychomphalus lineata Sayre, n. sp.
(Pl. XIV, figs. 5-5b.)
Shell small, conical, spire depressed. Volutions about four, increasing slowly in size, the last one equaling about half the height of the entire shell; triangular in outline, upper surface obliquely flattened parallel to the slope of the spire, periphery angular with about three-fourths of the volution above it; base slightly convex. Aperture oblique, triangular in outline; inner lip not reflected, slit deep and extending about one-fourth the circumference of the shell. Umbilicus absent. Slit band concave, narrow, situated about its own width above the peripheral angle, and bounded on each side by a pronounced ridge. Surface marked by numerous spiral lines, of which there are seven on the upper surface and a larger number on the lower surface. Peripheral angle marked by a strong, heavy ridge. All these are crossed by numerous lines of growth which extend backward from the suture to the slit band, where they are strongly recurved, and thence extend forward over the periphery and with slight sinuousity across the base. On the upper surface, particularly, they give the spiral lines the appearance of bearing many small nodes, and lend a finely crenate outline to the peripheral ridge. Dimensions: Height, 5.2 mm.; diameter, 6.5 mm.; apical angle, about 85 degrees.
This species resembles P. scitula more closely than any other Pennsylvanian species, but differs from it in its less prominent markings and lower spire. It has a much lower spire and stronger spiral markings than does P. subdecussata Geinitz.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Genus MURCHISONIA D'Archiac and De Verneuil.
Murchisonia matheri Sayre, n. sp.
(Pl. XVI, figs. 1-2.)
Shell small, high-spired, closely coiled, and obscurely turreted. The dimensions of a fair-sized individual are: Height, 13.5 mm.; breadth, 52 mm.; apical angle (variable) about 18 degrees. Volutions eight or nine, increasing very gradually in size, subcircular in the smaller portion, but becoming subangular in the larger portion, the sides being beveled so that they are nearly perpendicular. Suture well marked, linear. Aperture subovate and slightly extended below, inner lip slightly thickened, outer lip apparently cut by a pronounced slit, as indicated by the growth lines, which curve backward from the suture to about one-fourth of the height of the volution, where there is an obscure slit band equaling about one-fourth the height, and marked only by the lines of growth, which are strongly bent here, and thence pass slightly forward to the middle of the base. Surface smooth in appearance, but the lens reveals, besides the lines of growth, a number of fine, rather closely set, spiral lirae below the slit band.
This species is characterized, by its high spire, nearly smooth surface, and the minute spiral line on the lower portion of the shell.
Horizon and locality. Drum limestone, oolitic member, at Turner and Muncie, Kan.
Genus GONIOSPIRA Girty.
Goniospira helicaformis Sayre, n. sp.
(Pl. XV, fig. 2.)
Shell elongate, helicaform, high-spired. Composed of a large number of very gradually enlarging volutions, each of which is subquadrate in section, being angular at the suture, flattened or concave below it to a prominent angular carina, which passes around the periphery of the shell just below the middle, while at the base there is another carina, from which point the shell slopes inward to the middle with very slight convexity. On the second carina there are two heavy parallel ridges set close together, and the shell is so aligned that the succeeding volution falls on the upper of these two ridges, so that the structure is only seen on the last. The slit is apparently deep, narrow, with parallel edges, and situated on the periphery, its borders being marked by very inconspicuous spiral lines. Shell imperforate. Aperture subquadrate; inner lip thickened, and slightly twisted. The only marks on the surface are those already mentioned and the lines of growth, which slope slightly obliquely backward from the suture to the carina, on which they are strongly recurved, and thence curve forward with about the same curvature as on the upper slope. No complete specimens were found.
This species differs from Goniospira lasallensis Worthen in that the slit band is on the carina, and it lacks the prominent ridges on the periphery.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan.
Genus PHANEROTREMA Fisher.
Planerotrema ornatum Sayre, n. sp.
(Pl. XV, figs. 3-3b.)
Shell small, low-spired, almost discoidal. The dimensions of a relatively large specimen are: Height, 7 mm.; breadth, 10 mm.; apical angle, about 120 degrees. Volutions three to four, quadrangular or sublunate to elliptical in outline, the last one equaling about three-fourths the height of the entire shell. Upper portion of the volutions thickened so as to form an angular prominence next to the suture, below which the shell is concave outward to the angle, which is not quite peripheral, and bears a pair of close-set, sharp ridges. Below this the shell rounds rather abruptly to the base, which is gently convex. Inner lip reflected so as to leave a callused ring around the broad, shallow sulcus which it partially closes. Slit band situated on the upper side of the volution between the two ridges on the angle, and the volutions are so aligned that the shell below these two ridges is not seen on the lower volutions. Surface of the shell marked by a row of strong nodes just below the suture, and numerous spiral lines, which are rather obscure on the upper surface but become much stronger on the lower surface. Fine lines of growth cross the spiral lines in such a way that the whole surface of the shell has a nodose appearance.
This species is a lower spired form than P. grayvillense Norwood and Pratten, and the slit band is not peripheral.
Horizon and locality. Drum limestone, oolitic member, Turner, Cherryvale (station 40) and Independence (station 23), Kan.
Genus EUCONOSPIRA Longstaff.
Euconospira turbiniformis (Meek and Worthen).
(Pl. xv, fig. 5.)
1884. Pleurotomaria turbiniformis. White, 13th Rep. Geol. Surv. Ind., p. 160, pl. 32, figs. 7-8.
Meek and Worthen's description: "Shell rather large, trochiform; height and breadth nearly equal; spire conical, moderately depressed; volutions about five and a half, flat, last one distinctly angular around the periphery, and flattened or slightly convex below; umbilical region a little concave; umbilicus very small, and bound by a small, obscure, revolving ridge; spiral band extremely narrow, grooved, occupying the angle around the periphery of the body whorl, and passing around scarcely above the suture on the other volutions, margined above and below by a sharply elevated line; suture linear, having a somewhat banded appearance in consequence of the development of a rather distinct revolving line at the upper margin of each whorl; aperture apparently rhombic-subquadrate in form. Surface ornamented by about twenty obscure, closely arranged revolving striae, crossed by stronger, very regular transverse lines, which are most distinct on the upper part of the whorls, and pass with a gentle curve backward and outward to the spiral band. Below the angle the under side of the body whorl is nearly smooth, or only marked by very obscure lines of growth, and faint traces of revolving striae. Length, about 0.93 inch; breadth, nearly 0.97 inch; apical angle regular, divergence 64 degrees.
"This shell seems to be very closely allied to P. Riddelii, of Shumard, and a more careful comparison with his description leads us to suspect that it may possibly prove identical. Yet, as Dr. S. describes his species as having only twelve or thirteen revolving lines on each whorl, while our shells show uniformly nearly double this number, we are in doubt whether they should be considered identical or not. It is also related to Pleurotomaria missouriensis—(Trochus missouriensis, Swallow), but never attains so large a size as that noble species, from which it also differs. in having a much stronger transverse striae; while Prof. Swallow's species has not the prominent linear ridge just above and below the spiral band, seen in our shell."
The writer is in some doubt as to whether the shells referred to this species are not the young forms of E. missouriensis. The principal differences shown are the concave slit band, and the smaller angle, while the revolving lines of this form are not so strong as those seen in E. missouriensis. There is evidence to show that the angle of neither form is constant, but increases with the number of whorls developed. The number of volutions on the specimens at hand are seven, which is greater than the number given by Meek and Worthen.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan., and Kansas City, Mo.
Euconospira missouriensis (Swallow).
(Pl. XIII, fig. 12.)
1860. Trochus missouriensis. Swallow, Trans. St. Louis Acad. Sci., vol. 1, p. 657.
1894. Pleurotomaria missouriensis. Keyes, Mo. Geol. Surv., vol. 5, p. 136, pl. 48, figs. 3 a-b.
1897. Euconospira missouriensis. Ulrich, Geol. Minn., vol. 3, pt. 2, p. 956.
Shell large, conical, trochiform, with about eight or nine volutions, the breadth being a little greater than the height. Base flat or slightly convex, angular on the periphery, and flattened or only slightly convex on the sides, which are nearly parallel to the slope of the spire. The preceding volution overlaps the succeeding one slightly, so as to leave a strong linear suture on the lower portion of the shell, while the first two or three volutions are distinctly rounded, have a much wider suture, and a smaller spiral angle. Umbilicus small and passing all the way to the apex. Slit band convex, on the periphery, and marked on each side by a sharp spiral ridge. Lines of growth strongly bent. Surface ornamented by about forty spiral lines on the face of the largest volution, but with a much smaller number on the smaller portion of the shell. The base bears numerous very fine, regular, revolving lines. These increase by addition on the side next to the slit, and by occasional bifurcation. Crossing the spiral lines there are numerous very fine regular lines of growth which curve strongly and obliquely backward to the slit, which is deep and rather narrow, with parallel sides. Here they are strongly bent, and emerging on the base follow a gentle sigmoidal curve to the umbilicus. Every fourth or fifth line is stronger than the others.
Width of a specimen on which the spire is broken, 62 mm.; height, probably about 65 mm.; apical angle, 55 to 70 degrees.
This species differs from E. planibasalis in the less regular ornamentation of the base. The sculpture of the slit band and on the sides of the shell is identical with that figured by Ulrich. It differs from E. turbiniformis in its larger size and convex slit band.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan., and Kansas City, Mo.
Genus ORESTES Girty.
Orestes intertexta (Meek and Worthen).
(Pl. XIII, figs. 8-8a.)
1866. Pleurotomaria intertexta. Meek and Worthen, Geol. Surv. Ill., vol. 2, p. 356.
Shell small, trochiform, height about equal to the diameter, and composed of about five to six volutions, the last of which is equal to a little less than half the height of the entire shell. Volutions obliquely flattened or slightly concave above and subparallel to the slope of the spire; most prominent part a little. below the middle and consisting of two equally prominent carinae with the slit band placed between them; base flattened or slightly convex. On the upper volutions, only the upper one of the carinae is seen, the other being hidden by the succeeding volution of the shell. Just beneath the well-defined suture the volution is thickened and angular, and is ornamented with a row of nodes. Aperture subrhombic, inner lip thickened. Umbilicus small and deep. Surface ornamented 'with numerous closely set, small, spiral lirae, of which there are from one to three on the slit band. These are crossed by equally fine lines of growth which give the surface a beautifully cancellated appearance. The lines of growth curve obliquely backward from the suture to the slit band, where they are strongly reentrant, and thence pass forward at first, and then backward with a gentle curve, and into the umbilicus. Dimensions: Height, 7.2 mm.; diameter, 7 mm.; apical angle, 67 degrees.
This species seems to show some considerable variation of form. Of several hundred specimens which appear to belong in the same group the apical angle varies from 60 to 70 degrees; and the alignment and contour of the volutions show similar variations, which appear to depend to some extent on the stage of development of the individual. The larger fossils under discussion agree very well with specimens of O. intertexta from the type locality of that species.
Horizon and locality. Drum limestone, oolitic member, at Turner, Muncie and Independence (stations 9, 12, 23), Kim.
Genus WORTHENIA De Koninck.
Worthenia speciosa (Meek and Worthen)?
(Pl. XIII, figs. 11-11b.)
1860. Pleurotomaria speciosa. Meek and Worthen, Proc. Acad, Nat. Sci. Phil., p. 461.
1866. Pleurotomaria speciosa. Meek and Worthen, Geol. Surv. Ill., vol. 2, p. 352, pl. 28, figs. 5 a-c.
Shell about medium size, length slightly greater than the breadth, volutions six or seven, the last one forming about half the entire length. The volutions angular or carinate below the suture, and thence flat or concave to the carina, which is peripheral, and above the middle of the volution; below this the shell is again concave vertically, so as to produce a third angulation below the middle of the volution; the base of the volution is gently convex. Suture well defined. Slit band narrow, prominent, occupying the middle carina, and crenulated on the edges. Aperture subquatrate to subcircular. Umbilicus small, nearly closed. Surface ornamented by a varying number of spiral lines, generally about seven on the upper slope, about five or six on the outer slope, and still more on the base. Crossing these are numerous very fine and regular transverse lines of growth, some of which are considerably larger near the suture than the others, and form a row of nodes on the angulation just below the suture. Length, about 21 mm.; breadth, about 20 mm.; apical angle, about 82 to 90 degrees.
There are only two specimens of this species in the collections. They differ slightly from W. speciosa in not having such strong wrinkles at the superior angle of the whorl, and in being somewhat larger than that species. In other respects, however, it is very similar to the shell described by Meek and Worthen. It is quite different from W. subscaloris in being smaller, less acute, and in having the milled edge on the middle carina. It is not nearly so turbinate as W. tabulata, and lacks the strong nodes on the middle carina.
Horizon and locality. Drum limestone, oolitic and shale members, at Turner, Muncie and Independence (stations 12,23), Kan.
Family Trochonematidae
Genus STROPHOSTYLUS Hall.
Strophostylus peoriensis (McChesney).
(Pl. XVIII, figs. 2-2b.)
1860. Platyostoma peoriensis, McChesney, Desc. New. Pal. Foss., p. 62.
1865. Platyostoma peroriensis. McChesney, Ill. New Spec. Foss., pl. 2, figs. 11 a-b.
1868. Platyostoma peoriense. McChesney, Trans. Chicago Acad, Sci., vol. 1, p. 49, pl. 2, figs. 11 a-b.
Shell of medium size, sub ovate to subglobose, composed of about one to one and a half volutions, close, coiled, and expanding rapidly, becoming much inflated near the aperture, which is oblique, subquadrate or subrectangular with the corners rounded. Spire depressed. Suture well marked. Surface marked only by lines of growth, which are not prominent. Umbilicus closed. Dimensions: Height, 31 mm.; greatest breadth, 35 mm.
There is only one specimen of this species, from which most of the shell is broken off, leaving an internal cast.
Horizon and locality. Drum limestone, oolitic member, Kansas City, Mo.
Family Trochidae
Genus MICRODOMA Meek and Worthen.
Microdoma ornatus Sayre, n. sp.
(Pl. XVI, fig. 4.)
Shell small, high-spired, subtrochiform. Volutions six to seven, increasing rather gradually in size, the last one equaling about one-third of the entire height of the shell; flattened on a line with the slope of the spire and angular both above and below; base convex. Axis solid. Suture well marked. Aperture oblique, the inner lip being slightly reflected. Surface ornamented by two rows of small, closely set nodes, one just below the suture, the other on the peripheral angle, which lies slightly below the middle of the colution on the last, and just above the suture on the higher volutions. Lines of growth very fine, extending obliquely backward from the suture to the peripheral row of nodes and thence sigmoidally across the base to the depressed center. Dimensions: Height, 6.5 mm.; diameter, 4 mm.; apical angle, 48 degrees.
This species resembles M. conicus Meek and Worthen in shape, but has only two rows of nodes and a greater apical angle.
Horizon and locality. Drum limestone, oolitic member, Turner and Muncie, Kan.
Family Neritopsidae
Genus NATICOPSIS McCoy.
Naticopsis ? monilifera White.
(Pl. XVIII, figs. 6-6a.)
1880. Naticopsis monilifera. White, Cont. to Inv. Pal., No. 8, p. 168, pl. 42, figs. 3 a-c.
White's description: "Shell small subglobose; spire short, obtuse, and its immediate apex flattened; volutions about six, but the apical ones are very small, the last one constituting the greater part of the shell, broadest upon its basal or proximal portion, the proximal side of which is somewhat abruptly rounded inward to the aperture; the small volutions of the apex are plain, but upon the distal border of the two last ones, adjacent to the suture, there is a conspicuous row of small nodes, constituting a pretty ornamentation of the shell; the remainder of the surface has a polished aspect, upon which a good lens reveals fine striae of growth; aperture suboval in outline, inner lip having a distinct callus, especially in front; outer lip thin, its border sinuate, having an almost distinct notch just in front of the lOW of nodes.
Extreme length, 10 mm., extreme diameter of the last volution nearly the flame."
The one specimen of this species in the collections at hand is only partially preserved, but the extreme diameter shows a width of 17.5 mm.; and a height, 16 rum.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Naticopsis pricei Shumard.
(Pl. XVIII, figs. 1-1b.)
1858. Naticopsis (Nerita) pricei. Shumard, Trans. St. Louis Acad. Sci., vol. 1, p. 202.
Shumard's description: "Shell ovate, oblique, longer than wide; spire very much depressed, obtusely rounded at the apex; volutions two and a half or three, convex, the last one very large, regularly and rather strongly ventricose in young specimens, but. as the shell advances in age its upper portion becomes gradua.lly flattened and sometimes strongly channeled toward the aperture, and at the same time it becomes more or less shouldered just beneath the suture; below the flattened portion it is still evenly rounded to the base; suture indistinct at the apex, but gradually becoming more deeply impressed as it approaches the aperture; aperture large, rotundo-qua.drate, its height usually a little greater than the width; very oblique to the axis of the shell, contracted below near the columbella: lip sharp, strengthened above at its juncture with the columella by the callosity of the latter; columellar lip thick, concave, callous, smooth; surface marked with very fine lines of growth, and on the upper part of the volutions with rather strong plicastriae, which curve obliquely forward to the sutures. In some specimens the original coloring matter is still preserved, and the fossil presents a delicate vermilion hue.
"Dimensions: Spiral angle from 120 to 130 degrees; length from apex to base of an average specimen, .85; greatest width, .82; height of aperture, .50; width of same 45 degrees."
A number of the smaller specimens (height 10.5 mm.; width, 11 mm.; height of aperture, 9 mm.) agree quite well with N. nana Meek and Worthen. They differ, however, in being larger and in having the upper portion of the volution flattened. The larger specimens show about the same dimensions as N. pricei Shumard (breadth, 19.5 mm.; height 21 mm.) and appear to answer the description of that species very well.
Horizon and locality. Drum limestone, oolitic member, Turner, Muncie and Independence (station 9), Kan., and Kansas City, Mo.
Naticopsis scintilla Girty.
(Pl. XVIII, fig. 7.)
1915. Naticopsis scintilla. Girty, Mo. Bur. Geol. and Mines, vol. 13, 2d ser. p. 538, pl. 29, figs. 3-3c.
Shell very small, consisting of two or three rapidly expanding volutions, the height being somewhat greater than the width. The spire rises but very little above the last volution, which is greatly elongated below and somewhat depressed on the upper side just below the suture. The surface is marked by very fine lines of growth and, at regular intervals, by somewhat stronger lines. The umbilicus is closed and a distinct callosity is present.
This species is characterized by its very small size, and by the shape of its volutions, which are very much elongated and have a broad sulcus just below the suture on the upper side.
Horizon and locality. Drum limestone, oolitic member, Kansas City, Mo.
Naticopsis ? minuta Sayre, n. sp.
(Pl. XVIII, figs. 5-5a.)
Shell small, subdiscoidal, with depressed spire. Volutions about three, very rapidly enlarging, so that the last one equals three-fourths the entire height of the shell; subovate in section, and more or less compressed from top to bottom. Suture deep, well marked, but narrow. Aperture, oblique, subovate, Battened both above and below; outer lip rounded and thin; inner lip slightly reflexed and apparently forming a slight callus. Axis apparently solid. Surface smooth and unornamented except for the last volution, on which there is a row of small nodes just below the suture. Height of a large specimen, 4 mm.; breadth of same, 5.5 mm.; height of aperture, about 3 mm.; width of same, 3.4 mm.
This species is distinguished by its low spire and discoidal shape, as well as by the lack of ornamentation of the volutions, except for the spiral row of nodes on the last volution. It is referred with some hesitation to the genus Naticopsis, which has only one species (N. monilifera White) which is similar to this. Certainly typical Naticopsis forms are destitute of a row of nodes and in this respect it is more like a Pleurotomaria, but, although some very well preserved specimens have been studied, no trace of lines of growth, or any sign of a slit band has been found.
Horizon and locality. Drum limestone, oolitic member, at Muncie, Kan.
Family Pyramidellidae
Genus ZYGOPLEURA Koken.
Zygopleura rugosa (Meek and Worthen) ?
(Pl. XVII, fig. 9.)
1860. Lozonema rugosa. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p. 465.
1866. Lozonema rugosa. Meek and Worthen. Geol. Surv. Ill., vol. 2, p, 378, pl. 31, figs. 11 a-c.
Shell rather small, conical, spire elevated and having a divergence of about 24 degrees. Length of a nearly complete individual, 13 mm.; breadth of same, 4.4 mm. It consists of at least seven or eight volutions, and probably more, each of which is gently convex and bears about fourteen or fifteen sharp subvertical 'plications, which slope slightly forward from the suture and are arranged in line on the various volutions, so as to give a spiral appearance to the whole. Aperture ovate, acutely angular above, and slightly pointed below. Axis solid. Suture fairly deep and well marked. Plications becoming obsolete at the basal angle.
Some of these specimens seem to be considerably larger than the form described by Meek and Worthen. It is possible that they represent a new species, but with the poor material at hand it seems advisable to refer them to Meek and Worthen's species for the present.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 12), Kan.
Zygopleura teres Girty.
(Pl. XVII, fig. 13.)
1915. Zygopleura teres, Girty, Mo. Bur. of Geol. and Mines, vol. 13, 2d ser. p. 360, pl. 32, figs. 4-4a.
Inasmuch as all of the specimens of this species in these collections are more or less encrusted, Girty's description is given:
"Shell small, tapering, composed of seven or eight volutions. Length, 3 1/2 mm., diameter, 1 1/2 mm. The volutions are short with rather flat sides, strongly rounded below. They embrace so far as to leave a distinct though not deep suture, and the outline is therefore nearly smooth. The immature volutions increase in size more rapidly than the mature ones, so that the apical portion tends to be conical and the lower portion cylindrical, and a somewhat fusiform shape is produced. The aperture is small, oval. The axis is solid.
"The surface is marked by fine incremental lines parallel to the axis, which are gathered at regular intervals into fascicles or obscure plications.
"Z. teres is distinguished by its minute size, its fusiform shape, its slightly indented sutures and its obscure corrugations. In one or all of these particulars it differs from other American species, so that more detailed comparisons are not necessary. Indeed, the species is somewhat doubtfully referred to Zygopleura at all, and would perhaps better be placed under Pseudomelania. It resembles Z. nana, but is less distinctly corrugated."
Horizon and locality. Drum limestone, oolitic member, at Kansas City, Mo.
Zygopleura attenuata (Stevens) ?
(Pl. XVII, fig. 12.)
1858. Chemitzia attenuata. Stevens, Amer. Jour. Sci., (2) vol. 25, p. 259.
1915. Zygopleura attenuata. Girty, U. S. Geol. Surv., Bull. 544, p. 182.
[available online]
Shell small, turreted, slender, consisting of somewhat more than six volutions, each of which is somewhat shouldered and bears a row of nodes just beneath the suture, each of which is extended below and gradually dies out as the bottom of the volution is reached, so that the lower portion is nearly smooth. Sides flattened, suture well marked by reason of the shoulder. Axis solid. Aperture subcircular. Volutions increasing more rapidly in size near the apex, so that the apical angle in different parts of the spire is not uniform.
It is with some doubt that this shell is referred to Z. attenuata, as that description is not complete and the shell described is apparently somewhat smaller. The largest of the specimens at hand are not complete, but are at least as large as the shell described by Stevens.
Horizon and locality. Drum limestone, oolitic member, at Muncie, Kan.
Zygopleura multicostata (Meek and Worthen).
(Pl. XVII, fig. 7.)
1915. Zygopleura multicostata. Girty, U. S. Geol. Surv., Bull. 544, p. 184, pl. 25, fig. 2. [available online]
Meek and Worthen's description: "Shell small, conical, spire moderately elevated; volutions about seven and a half, somewhat convex, increasing gradually in size, last one forming about one-third the entire length, rounded but not much produced below; suture well defined; aperture oval subrhombic, slightly effuse on the inner side below; outer lip thin and nearly straight; inner lip a little reflexed. Surface ornamented by small, regular, straight, vertical folds or costal, about equaling the spaces between and numbering near thirty on the body whorl. costae obsolete on the under side of the last turn; no lines of growth visible under a lens. Length, 0.36 inch; breadth, 0.15 inch; apical angle nearly regular, divergence about 28 degrees.
"This species resembles the last two in its general appearance, but differs in having more numerous, smaller, and more closely arranged costal. Its whorls are also more convex, and its suture deeper. It is more nearly allied to L. scalaroidea (sp.) of Phillips, but differs from de Koninck's figures of that species in having perfectly straight, instead of flexuous, costae. The number of its costae is also less than in L. Scalaroides, and its spiral angle is greater than given by de Koninck in his description (22 degrees), though less than represented in his figures (about 32 degrees)."
No complete specimens of this species were found.
Horizon and locality. Drum limestone, oolitic member, at Turner and Muncie, Kan.
Zygopleura plicata (Whitfield) ?
(Pl. XVII, fig. 8.)
1915. Zygopleura plicata. Girty, U. S. Geol. Surv., Bull. 544, p, 183. [available online]
Shell very small, elongate, conical. Spire elevated and regularly tapering. Volutions about eleven, flattened in the direction of slope of the spire on the outer side. Suture distinct but not deep. Aperture elongate oval, slightly pointed below, and angular above. Axis solid. Surface ornamented on the last volution with about fourteen or fifteen plications and by nearly as many of the upper volutions, which are set at a slight angle to the axis of the spire, so that the upper end is slightly behind the lower, and the plication on the next volution above is set in line with the first, so as to give the whole a somewhat spiral arrangement on the shell. Crossing these are very fine spiral striae, which give them a slightly crenate appearance. No complete specimens of this shell are found in the collections, but the largest is 12.5 mm. long, and 4 mm. wide, with an apical angle of 18 degrees.
Among the specimens referred to this species, there is a variation of three or four degrees in the apical angle; the suture is variable, although the shape of the volutions is fairly constant, and the number of plications remains, within rather narrow limits, about the same, although in some cases they are not so well marked as in others.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 12), Kan.
Zygopleura nana Girty
(Pl. XVII, fig. 10.)
Zygopleura nana. Girty, Mo., Bur. Geol. and Mines, vol. 13, 2d Ser., p. 360, pl. 32, figs. 5-5 a.
Girty's description: "Shell small, conical, 1 mm. in diameter, rather less than 3 mm. long, composed of six or seven volutions. Volutions rather high, flattened at the sides and abruptly rounding below, embracing so far as to leave but a shallow suture and give the shell as a whole a smooth conical shape. The rate of increase in the size of the whorls is greater, however, in the younger than in the older stages, which renders the shape somewhat fusiform. The aperture is small, oval. The axis is solid. The sides are marked by rather large, rather strong, longitudinal plications about fourteen to a volution.
"This species is most closely allied to Z. rugosa and perhaps it might be considered only a dwarfed variety of it, especially as most of the associated species are small. Aside, however, from being only one-third as large, though composed of the same number of volutions, the volutions are comparatively higher, with flatter sides and shallower sutures, and the plications are less numerous."
Horizon and locality. Drum limestone, oolitic member, at Turner and Muncie, Kan., and Kansas City, Mo.
Genus HEMIZYGA Girty.
Hemizyga? cancellata Sayre, n. sp.
(Pl. XVII, fig. 11.)
Shell small, subconical, rather low-spired, the apical angle being 50 degrees. Volutions few in number, very convex and subcircular in outline, increasing rather rapidly in size, so that an almost shouldered appearance is given to the shell. Suture deep and very well marked. Aperture sub ovate, pointed above and slightly extended below; outer lip regularly rounded; inner lip nearly straight, oblique to the axis of the shell, and very' slightly reflected. Axis solid. Surface marked on the upper volutions by about thirteen heavy longitudinal costae, which become obsolete, or nearly so, on the last volution; crossed by rather fine, closely set spiral lirae, which, together with the nearly obsolete longitudinal costae, form a more or less latticed pattern on the last volution, and serve to crenulate the costae on the upper volutions.
This species is distinguished by its comparatively large apical angle and its surface ornamentation, as well as by the rapid increase in the size of its volutions. There is some doubt as to whether this shell belongs with Girty's genus Hemizyga as it shows spiral lirae on all parts of the volution, while in his typical species these are developed only on the lower portion. The apical angle is much larger and the spire more depressed than on any of his species. It bears some resemblance in form to Sphaerodoma gracilis Cox, but differs in possessing spirallirae and in its larger apical angle.
Horizon and locality. Drum limestone, oolitic member, Turner, Kan.
Genus BULIMORPHA Whitfield.
Bulimorpha chrysallis (Meek and Worthen).
(Pl. XVI, fig. 9.)
1903. Bulimorpha chrysallis. Girty, U. S. Geol. Surv., Prof. Paper 16, p, 466, pl. 10, figs. 6-6a, 7-7a. [available online]
Shell small, spire conical, moderately elevated and pointed at the apex. Dimensions of a large individual are: Height, 8 mm.; breadth, 4.4 mm.; apical angle, about 45 degrees (not regular). Volutions about six or seven, slightly convex, the last one forming about two-thirds the entire length. Suture distinct. Aperture narrow, elongate, angular above, rounded and produced below, but somewhat ventricose in the middle. Inner lip wanting; columella arched and twisted. Surface smooth except for obscure lines of growth.
The shell is somewhat smaller than that figured and described by Meek and Worthen as B. chrysallis, and the volutions are a little more convex in the upper portion. In other respects it agrees very well, however.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Bulimorpha meeki Sayre, nom. nov.
(Pl. XVI, fig. 6.)
1873. Actaeonina minuta. Meek and Worthen, Geol. Surv. Ill., vol. 6, p. 594, pl. 29, fig. 2.
Shell very small, elongate, subterete. Volutions about five, slightly flattened on the sides, and very convex above, so as to give each a more or less shouldered appearance, last one equaling a little more than half the entire height of the shell. Suture well marked by reason of the convexity of the shell. Aperture elongate-ovate, acutely angular above, and apparently rounded below, so that the aperture equals about two-fifths of the entire height of the shell. Columella slightly arched, smooth, inner lip apparently lacking. Surface smooth except for very fine growth lines. Apical angle, 40 degrees; length, about 5 mm.; breadth,2 mm.
This shell is readily distinguished from all other Pennsylvanian forms by reason of its small size, aperture rounded below, and the shouldered appearance of the volutions.
Girty has pointed out the inconsistency which exists between the form figured by Meek and Worthen as B. minuta Stevens, and that described by Stevens (Girty, 1915, p. 363). The specimens here described agree with the figures of Meek and Worthen, which undoubtedly represent a new species.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan.
Bulimorpha turnerensis Sayre, n. sp.
(Pl. XVI, fig. 7.)
Shell very small, elongate, fusiform, the dimensions of a large individual being: Length, 6.5 mm.; breadth, 2 mm.; apical angle, about 15 degrees. Volutions about five, the last one equaling fully three-fourths the length of the shell; not very convex; elongate-ovate in section and slightly flattened on the sides. Suture poorly defined. Aperture lance-ovate, very acutely angular at the top, and somewhat rounded at the bottom; outer lip straight, and thin; inner lip apparently not reflected. Columella slightly bent. Surface smooth and lines of growth invisible even under the magnifier.
This shell is so elongated that it does not resemble any other Pennsylvanian species. It is distinguished, also, by the lack of convexity of the volutions, and the great length of the body whorl in comparison to the rest of the shell.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Genus SPHAERODOMA Keyes.
Sphaerodoma fusiformis (Hall) ?
(Pl. XVI, fig. 10.)
1910. Soleniscus fusiformis. Raymond, Ann. Carnegie Mus., vol. 7, p. 156, pl. 24, fig. 7.
Hall's description: "Shell elongate, subfusiform. Spire gradually tapering from the last volution, which is more ventricose, consisting of seven or more volutions, which are very moderately convex except the last. Suture line faint in the shell, deeply canaliculate in the cast; aperture not fully known, nearly equaling half the length of the shell.
"This shell corresponds in general form and characteristics with M. missouriensis of Swallow, but the angular character of the volutions in the cast is not observed."
The specimens in the collections representing this group are rather poorly preserved, being either broken or covered with a coating of lime carbonate. In general appearance they seem similar to Hall's specimens, but no thickening of the inner lip is observed. The fold is sharp, and situated just below the middle of the volution.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan.
Sphaerodoma paludinaeformis (Hall).
(Pl. XVI, fig. 5.)
1915. Sphaerodoma paludinaeformis. Girty, U. S. Geol. Surv., Bull. 544, p. 200, p. 207, pl. 24, figs. 5-6a. [available online]
Shell small, acute ovoid; the last volution ventricose, rapidly tapering, and about equal to the spire in height. Volutions five or six, the upper ones moderately convex. Suture line well marked on the last three or four volutions, but obscure on the upper ones. Aperture subovate, rather narrow and pointed above, but not much extended below, not quite half as high as the entire shell. Fold on the columella sharp, and situated a little below the middle of the aperture. Surface marked only by very fine lines of growth. Dimensions of a large individual are: Height, 7 mm.; breadth, 4 mm.; apical angle, about 52 degrees.
This shell is somewhat smaller than the one figured by Hall in his Iowa report, but shows the same general outline, and since many of the species in this horizon are somewhat dwarfed, it is probably identical. These specimens are certainly identical with the one figured by Marks in a report of the Ohio Geological Survey; and if Marks is correct in referring her specimens to this species, the specimens at hand may also be so referred.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan.
Sphaerodoma primigenius (Conrad).
(Pl. XVI, figs. 3-3a.)
1915. Sphaerodoma primogenia. Girty, U. S. Geol. Surv., Bull. 544, p. 208, pl, 24, figs. 13-17a. [available online]
This species is represented by one cast. It is large, subglobose, consisting of three and a half whorls. Volutions rapidly expanding, subovate in outline, sides convex, rapidly expanding, the last one equaling half the height of the shell. Suture deep, linear. Dimensions: Height, 38 mm.; diameter, 29 mm.; apical angle, 93 degrees.
Horizon and locality. Drum limestone, oolitic member, Independence (station 12 ?), Kan.
Genus SOLENISCUS Meek and Worthen.
Soleniscus typicus Meek and Worthen.
(Pl. XVI, fig. 8.)
1913. Soleniscus typicus. Mark, Geol. Surv. Ohio, 4th ser. Bull., No. 17, p. 317, pl. 16, fig. 16.
Shell small, high-spired, fusiform, conical. Whorls, about six, increasing rather rapidly in size, the last one forming about three-fourths the entire height of the shell. Volutions narrowly rounded above, expanding in the middle, and contracting rather gradually into the somewhat extended canal below. Aperture narrow, lancelike; outer lip thin; fold on the columella a little below the middle of the aperture. Suture shallow. Surface marked by very obscure lines of growth. Dimensions: Height, 8.4 mm.; breadth, 4.6.; apical angle, about 42 degrees.
This shell is somewhat smaller than the form figured and described by Meek and Worthen; otherwise the description applies to it very well.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan.
Family Epitoniidae
Genus ACLISINA De Koninck.
Aclisina stevensana (Meek and Worthen).
(Pl. 17, XVII, fig. 5.)
1913. Aclisina stevensana. Mark, Geol. Surv. Ohio, 4th Ser. Bull. No. 17, p. 313, pl. 16, fig. 5.
Shell small, subterete. Volutions about ten or twelve, increasing very gradually in size, convex, all showing a narrow, obliquely flattened space just below the suture; sides slightly flattened, base convex. Suture well marked, as a result of the convexity of the volutions; surface ornamented below the obliquely flattened space at the top of the volutions by small, prominent revolving costae, of which about four show on each of the upper, and about six or seven on the last volutions. Crossing all these may be seen numerous very fine lines of growth which bend distinctly backward from the suture, and then curve forward over the lower edge of the volution. Aperture subcircular and sinuate on the outer margin; lower portion slightly extended; inner lip apparently not callused; axis solid.
Dimensions of large individual: Height, 8 mm. (top of spire broken away); breadth, 3 mm.; apical angle, regular 20 degrees.
This shell differs from A. swalloviana Geinitz in its size, number of volutions, more revolving costae, and in the sides of the volutions being somewhat flattened, while the suture is not so deep as in that species, the upper, smooth, flattened portion being narrower.
Horizon and locality. Drum limestone, oolitic member, at Turner and Independence (station 23), Kan.
Aclisina swalloviana (Geinitz).
(Pl. XVII, fig. 6.)
1866. Turbonilla swalloviana. Geinitz, Carb. und Dyas in Neb., p. 5, Tab. 1, fig. 19.
1872. Aclis swalloviana. Meek, U. S. Geol. Neb., p, 229, pl. 11, figs. 7 a-b.
Shell very small, turreted, and quite elongate. Dimensions of a medium-sized individual: Height, 3.5 mm.; breadth, 1.2 mm.; apical angle of 17 degrees, quite regular. Volutions about eight, convex, increasing gradually in size; upper surface next to the suture smooth, flattened, and sloping outward; sides slightly flattened vertically, and bearing on the upper volutions four spiral lines, while on the body whorl there are five. Aperture subovate, a little pointed above, sinuous and thin on the outer side; a little extended below, and apparently not reflected on the inner side. Axis apparently quite solid.
This shell is similar in most respects to A. swalloviana Geinitz, but differs from it in being a more slender shell, the apical angle being constantly three degrees smaller than that given for that species. It differs from A. breva in having more spiral lines, and in being more slender.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Aclisina breva Sayre, n. sp.
(Pl. XVII, fig. 0
Shell very small, turreted, and rather robust, The dimensions of a fairly large specimen are: Height, 5.5 mm., breath, 2.8 mm.; apical angle very nearly constant, 28 degrees. Volutions about seven, convex, increasing rather rapidly in size, the last one equaling about one-fourth the entire height; all distinctly flattened just below the suture; the flattened space sometimes marked by a very faint line near the middle; sloping outward and separated from the suture by a very narrow area, and distinct angle. Surface below the flattened area marked with revolving lines, of which two are generally seen on the upper volutions, and six on the last. Aperture subovate, pointed above, slightly extended below; outer lip thin; inner lip slightly thickened, and a very little reflected. Axis solid. Fine lines of growth may be seen extending obliquely backward from the suture, and thence curving forward over the lower edge of the volution, so as to give a rather sigmoidal outline.
This species differs from A. minuta Stevens in having a much smaller number of revolving lines, and a little larger apical angle. He makes no mention of the shape of the volutions or of the flattened area on the upper side. It differs from A. conditi Mark in having a smaller number of lines on the upper volutions, in being a little larger, and in not having the flattened area next to the suture. A. swalloviana (Geinitz) has a much smaller apical angle.
Horizon and locality. Drum limestone, oolitic member, at Turner and Muncie, Kan.
Aclisina parallela Sayre, n. sp.
(Pl. XVII, fig. 1.)
Shell very small and slender. Dimensions of a broken shell of apparently medium size are: Height, 5.5 mm.; diameter at top, 1 mm.; diameter at bottom, 1.6 mm. Volutions five, convex, increasing very gradually in size. Aperture subovate, with outer lip sinuous; lower lip somewhat extended; inner lip apparently neither reflected nor thickened. Axis imperforate. Suture well marked. Surface with seven spiral lines, of which five appear on the upper volutions. Lines of growth unknown.
This species resembles none of the species previously described. It is much longer, more attenuated and has a larger number of spiral lines. It lacks the smooth, obliquely flattened space on the upper part of the volution next to the suture, and has a more elongate-ovate section of the volution.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Genus ORTHONEMA Meek and Worthen.
Orthonema liratum Sayre, n. sp.
(Pl. XVII, figs. 2-3.)
Shell small, elongate conical, acutely pointed at the apex. The dimensions of a specimen slightly under medium size are: Height, about 11 mm.; breadth,3.2 mm.; apical angle, about 13 degrees (larger near the apex). Volutions eleven or twelve, vertically flattened around the middle and a little convex, but not much extended below. Suture linear, rather well defined. Aperture ovate, angular above, and rounded or slightly effuse on the inner side below; outer lip thin, and nearly straight; inner lip rounded; columella arcuate. Surface ornamented by four spiral lines, only three of which are seen on the upper volutions of the shell; two on the upper part of the whorl just behind the suture, and a third on the lower part of the whorl, just above the suture; the fourth is so situated that, as a rule, the succeeding volutions fall on it and it appears only on the last volution. It is paired with the lowest of the other three volutions. Lines of growth small and nearly straight until they reach the under side of the volution, where they arch a little forward, and then curve backward to the base of the columella.
This shell differs from O. salteri Meek and Worthen, which it most closely resembles, in having an apical angle of at least 10 degrees less, in being somewhat turreted, in having always the additional line on the base of the last volution, which sometimes shows on the higher volutions, and in being a slightly smaller species.
Horizon and locality. Drum limestone, oolitic member, at Turner and Muncie, Kan.
Family Purpurinidae
Genus TRACHYDOMIA Meek and Worthen.
Trachydomia wheeleri (Swallow) ?
(Pl. XVIII, figs. 4-4a.)
1910. Trachydomia wheeleri, Raymond, Ann. Carnegie Museum, vol. 7, p. 156, pl. 24, fig. G.
Shell of medium size, subglobose. The dimensions of a fairly large individual are: Height, 15 mm.: breadth, 13 mm. Volutions three, the last one equaling about three-fourths the entire height of the shell, subovate to subcircular. Aperture subovate, with the upper extremity angular. Suture linear, well marked, and bounded on the lower side by a narrow concave area marked only by growth lines, below which the shell is convex and nodose. The nodes are arranged in rows parallel to the growth lines; most prominent near the suture, and becoming smaller near the base. Surface wrinkled near the aperture.
This shell differs from T. wheeleri in the wrinkling of the shell close to the aperture; the nodes are more closely situated and do not have a small depression on each of them. However, specimens of T. wheeleri in the various collections show considerable variation in these respects. It differs from T. nodulosa in lacking the notch at the lower extremity of the aperture and from T. nodosum Meek and Worthen in having the nodes regularly arranged and more closely spaced, and in being a much smaller shell.
Horizon and locality. Drum limestone, oolitic member, at Turner and Muncie, Kan., and Kansas City, Mo.
Trachydomia pustulosa Sayre, n. sp.
(Pl. XVIII, figs. 3-3a.)
Shell small, subglobose, higher than wide. Dimensions of fairly large specimen: Height, 12 mm.; greatest breadth, 11 mm. Volutions three, rapidly enlarging, the last one equalling about three-fourths the entire height of the shell; a slight constriction passes around the shell a little above the middle of the volutions, and is most pronounced on the last. Aperture sub ovate with an acute angle above; lower lip slightly extended; inner lip very little callused. Surface covered with small indistinct nodes which are irregularly arranged, and serve to give a rough appearance to the surface. Suture indistinct even on the lower part of the shell, and very obscure on the upper.
The specimens of this group are of varying sizes, and it is distinguishable, even in the younger shells, from other species. It is characterized by the obscure suture, the rough irregular surface, and the depressed upper volutions.
Horizon and locality. Drum limestone, oolitic member, at Muncie and Turner, Kan., and Kansas City, Mo.
Cephalopoda
Family Orthoceratidae
Genus ORTHOCERAS Breynius.
Orthoceras occidentale Swallow ?
(Pl. XIX, figs. 1-2a.)
1858. Orthoceras occidentale. Swallow, Trans. St. Louis Acad. Sci., vol. 1, p, 201.
1894. Orthoceras occidentale. Keyes, Mo. Geol. Surv., vol. 5, p. 226.
Shell elongate conical, flattened slightly on the side next the siphuncle. Tapering rather suddenly. Septa very concave and separated by about one-sixth the diameter of the shell, not noticeably sinuous in contact with the periphery. Siphuncle round, and situated about one-third of the diameter of the fossil from the flattened side. Surface smooth, revealing no markings even with the aid of a hand lens.
Diameter of the largest fragment, 16.5 mm.; and the convexity of the septa is more than equal to the distance separating them.
The species under consideration is referred to O. occidentale with some hesitation, as Swallow's description is not very complete. It is distinguished by the location of the siphuncle, and the convexity of the septa. It tapers more rapidly than does O. kansasense, and is not so flattened, the side away from the siphuncle being regularly rounded. The smooth surface distinguishes it from O. moniliforme Swallow.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Orthoceras kansasense Sayre, n. sp.
(Pl. XIX, figs. 9-12.)
Shell large, elongate, ellipto-conical, tapering gradually and flattened on the sides, so as to give an elliptical cross section. Septa arched toward the apex on the flattened sides and convex; distant about one-eighth of their shorter diameter. Siphuncle small, situated slightly less than one-fourth the diameter from the flattened side. Surface markings not seen. As the apex is approached, the flattening of the sides of the shell becomes less pronounced until, at a diameter of 15 mm. the flattening is scarcely perceptible.
The smaller fragments of this shell bear a strong resemblence to O. aculeatum Swallow, but since he gave no figures of his species and the description is incomplete, a comparison is difficult to make. The older fragments resemble O. illinoisense from the Chester series, but differ from it in having a smaller siphuncle, although the other proportions are nearly the same.
Horizon and locality. Drum limestone, oolitic member, at Kansas City, Mo., and Turner, Kan.
Genus PSEUDORTHOCERAS Girty.
Pseudorthoceras knoxense (McChesney).
(Pl. XIX, figs. 3-5.)
1915. Pseudorthoceras knoxense. Girty, U. S. Geol. Surv., Bull. 544, p. 227, pl. 27, figs. 1-6. [available online]
Shell rather small, tapering gradually, round, composed of many chambers which are about one-third the diameter of the shell in height, septa only moderately convex. Siphuncle, small, central. Outline of the septa on the shell slightly sinuous. Shell thin, surface marked by numerous small pits, which are without regular order. Other surface markings unknown.
In a distance of 20 mm., the shell tapers from 6.4 mm. to 3.6 mm. Body chamber and aperture unknown.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Family Trigonoceratidae
Genus EPHIPPIOCERAS Hyatt.
Ephippioceras divisum (White and St. John) ?
(Pl. xx, figs. 1-2a.)
1868. Nautilis divisus. White and St. John, Trans. Chicago, Acad. Sci., vol. p. 124, fig. 9.
1891. Ephippioceras divisum. Hyatt, 2d Ann. Rep. Geol. Surv. Tex., p. 350, figs. 52-54.
Shell large, closely coiled, and measuring in its greatest diameter 65 mm.; greatest breadth, 67 mm.; length of the body chamber, 62 mm.; breadth of body chamber at rear end, 47 mm.; diameter of umbilicus, about 9 mm. Volutions increasing rapidly in size, about three in number; the first one being circular and the others developing rapidly into a sub ovate or kidney-shaped form. Early volutions entirely hidden by the last, which increases more rapidly in size than do the early ones, and is somewhat less deeply impressed. Chambers rather thin and narrow, septa passing radially from the umbilicus to the middle of the keel, where they are abruptly bent forward, forming a narrow, angular, ventral saddle and being divided internally by a dorsoventral median saddle. Siphuncle small, situated in about the middle of the median saddle in the later septa, but slightly nearer to the dorsal side as the apex is approached. Surface marked by rather fine lines of growth, with regularly spaced, deeper striae about every fifth or sixth one, curving radially outward from the umbilicus and then broadly curving across the venter.
This specimen is much smaller than that figured as the type of the species, and does not increase quite as rapidly in size laterally as does the type, nor does it show a broad, shallow, longitudinal sulcus. It may represent the young of the species. It differs from E. ferratum Cox in having the volutions much wider than high, while the diameter is much less in comparison to the greatest width.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan., and Kansas City, Mo.
Family Rhineceratidae
Genus DISCITES McCoy.
Discites toddanus Gurley.
(Pl. XX, figs. 3-5.)
1883. Discites toddanus. Gurley, New Carb. Fossils, Bull. No., p. 7.
1890. Discites toddanus. Anon., The Naturalist (Kansas City), vol. 4, No. 10.
Shell of medium size closely coiled in a plane. Whorls increasing gradually in size, the last one being subquadrangular in outline; the dorsolateral margins angularly rounded; the sides compressed, nearly flat; venter depressed, flattened, and bounded by a sharp angle on each side. Greatest width at the dorsolateral margin, where the width is about equal to the height of the volution, and from which the sides converge toward the keel. Umbilicus small, the volutions being rather deeply impressed, most of the earlier volutions being hidden by the succeeding ones. The first two volutions are nearly circular, the change in shape being introduced rather suddenly and remaining constant through the rest of the shell. Septa rather closely arranged, strongly arched toward the apex on the sides to the ventrolateral margins, and thence passing nearly straight across the keel. Siphuncle of medium size, and situated about one-fifth the height of the volution from the ventral margin. Surface marked by fine lines of growth, closely spaced and regularly set, curving radially from the umbilicus and with a very strong backward curve on the keel. The angle of the keel not showing so strongly on the shell as on the cast, and showing a pair of very small parallel ridges which divide it into thirds.
Diameter, 33 mm.; convexity, 15.5 mm.; height of volutions, 17.5 mm.; diameter of umbilicus 6.5 mm.
This shell is exactly similar to Gurley's type and comes from the same horizon.
Horizon and locality. Drum limestone, oolitic member, at Turner, Kan.
Family Tainoceratidae
Genus METACOCERAS Hyatt.
Metacoceras cavatiforme Hyatt.
(Pl. XXI, figs. 2-2a.)
1891. Metacoceras cavatiformis. Hyatt, 2d Ann. Rep. Geol. Surv. Tex., p, 334, figs. 30-33.
Shell attaining a rather large size, closely coiled. Whorl section rather irregularly hexagonal, consisting of a rather narrow ventral surface, two broad lateral surfaces, two umbilical zones, and an impressed zone, all narrow. The ventral surface is marked by a broad, rather shallow depression, flanked by two low subangular ridges, beyond which the shell is again depressed to the ventral shoulders. Sides nearly flat and sloping distinctly outward from above to the umbilical shoulders. Impressed zone rather shallow. Umbilical faces slightly convex. Ventrolateral shoulders sharply angular, distinct, and marked with a row of nodes, one node on each chamber; umbilical shoulders not so sharp, more rounded. Transverse diameter slightly greater, and increasing more rapidly than dorsoventral diameter. The volutions assume an angular form at about one-half a volution and at about the same time become marked with transverse costae, which become obsolete at about one and one-half volutions. Surface of the shell unknown. Septa showing broad, shallow lobes on the ventral and lateral surfaces with rather sharp angular saddles at the ventrolateral shoulders.
Horizon and locality. Drum limestone, oolitic member, at Kansas City, Mo., and Turner, Kan.
Metacoceras cavatiformis var. angulatum Sayre, n. var.
(Pl. XX, figs. 6-6a.)
Shell of medium size, closely coiled. Whorl section irregularly hexagonal, consisting of a rather narrow, flattened ventral surface, two broad lateral surfaces, two narrow umbilical zones and a narrow impressed zone. The ventrolateral and umbilical angles are distinct, angular, or a little rounded. The ventral surface is marked by a broad, rather shallow depression flanked on both sides by low ridges, beyond which the shell is again depressed to the ventrolateral angles. Sides flattened and sloping distinctly outward from above to the umbilical shoulder. Umbilical shoulders abruptly angular, with nearly a 90-degree angle. Umbilical surfaces flat. Dorsoventral diameter increasing more rapidly than the transverse. Both the umbilical and the ventrolateral shoulders on the shell are marked with rows of nodes which are scarcely distinguishable on the ventrolateral shoulders of the cast, and cannot be seen on the umbilical shoulders. These occur on each chamber. The shell is marked from one-half a volution to a little over one-half a volution with transverse pilae or costae, the only other markings being faint lines of growth. The shell assumes an angular form at about one-half a volution. Septa with a broad, shallow lobe on the lateral sides, and a less deep lobe on the ventral side. Siphuncle small, a little ventral of the center.
Dimensions: Breadth of volutions across ventral surface, 18.4 mm.; across umbilical shoulders, 23 mm.; height of volution, 22 mm.; diameter of entire shell, 55 mm.; diameter of umbilicus, 20 mm.
This variety is similar to M. cavatiforme, but differs from it in increasing more rapidly in size dorsoventrally than laterally, in showing a somewhat stronger curvature on the lateral lobes, and in having less strong nodes.
Horizon and locality. Drum limestone, oolitic member, at Kansas City, Mo.
Genus TAINOCERAS Hyatt.
Tainoceras occidentale (Swallow).
(Pl. XXI, figs. 3-3a.)
1911. Tainoceras occidentalis. Raymond, Penn. Topog. and Geol. Surv. Comm. Rept. for 1908-10, pl. 6, fig. 7.
Shell of medium size, coiled in a plane; volutions a little wider transversely than dorsoventrally, and increasing rather gradually in size. In cross section the volution is heptagonal. Abdomen with two rows of nodes alternating in position and separated by a rather narrow, deep, longitudinal furrow. The abdominal shoulders bear a row of much stronger nodes, generally so placed that each alternate chamber has a pair of them, one on each shoulder. Each of the umbilical shoulders has a row of somewhat smaller nodes. Umbilicus wide and shallow, with nearly all of the preceding volutions visible. Septa very concave on the sides and silghtly less concave on the abdomen, with a pronounced saddle on each of the ventral shoulders. Siphuncle large, subcentral. Aperture and body chamber unknown.
Although there are only two fragments of this species at hand, these agree so well with the original description that there can be little doubt as to the correctness of the identification.
Horizon and locality. Drum limestone, oolitic member, at Kansas City, Mo.
Family Aganididae
Genus GONIOLOBOCERAS Hyatt.
Gonioloboceras parrishi (Miller and Gurley) ?
(Pl. XVIII, figs. S-8b.)
1896. Goniatites parrishi. Miller and Gurley, Bull. III. State Mus. Nat. Hist., No. 11, p. 36, pl. 4, figs. 6-8.
1903. Milleroceras parrishi. Smith, Monog. U. S. Geol. Surv., vol. 42, p. 127, pl. 16, figs. 6-8. [available online]
1915. Gonioloboceras parrishi? Girty, Mo. Bureau Geol. and Mines, vol. 13, 2d ser., p. 364.
One shell in the collections appears to be a small individual of this species in a state of excellent preservation.
Shell very small, discoidal, volutions flattened laterally and inclined slightly toward the ventral margin; abdomen abruptly and narrowly rounded. Volutions increasing more rapidly in the dorsoventral diameter than in the transverse diameter, the outer ones embracing the inner completely and leaving a small, deep umbilicus. Septa curving gently forward on the side of the volution to about the middle, where there is small subangular lobe, while apparently a second deeper and sharper lobe occupies the venter. Surface marked by fine lines which curve sigmoidally backward from the umbilicus, and thence forward on the shoulders and backward again on the ventral surface.
Diameter, 7 mm.; convexity, 3.8 mm.; dorsoventral diameter of last volution,4 mm.
As will be noted, this shell does not show the ventral saddle which G. parrishi shows, but it is much smaller and may be the young of this species.
Horizon and locality. Drum limestone, oolitic member, Turner, Kan.
Gonioloboceras goniolobum (Meek).
(Pl. XXI, fig. 5.)
1877. Goniatites goniolobus. Meek, U. S. Geol. Expl. 40th Par., vol. 4, p. 98, p. 9, figs. 5-5b.
1900. Goniatites goniolobus. Knight, Wyo. Univ. Exp. Sta. Bull., No. 45, p. 129, pl. 3, fig. 8.
1903. Gonioloboceras goniolobum. Smith, Monog. U. S. Geol. Surv., vol. 42, p. 123, pl. 4, figs. 1-3. [available online]
The specimen at hand is somewhat broken, therefore Meek's description is given:
"Shell distinctly discoid, with (in internal casts) a narrowly rounded periphery; volutions compressed laterally, with slightly convex sides, the greatest convexity being a little within the middle; about twice as wide in the dorsoventral diameter as at right angles to the same; each turn embracing all the others, so as to leave only a very small umbilicus, showing none of the inner volutions. Septa closely and very regularly arranged, but nowhere in contact or lapping upon each other; siphonal lobe (generally called the dorsal lobe) very large, and profoundly divided into two large, elongate, acutely pointed terminal branches, which lap so far over each side of the volutions as to appear each like a large lateral lobe, while between these there is a third minute central projection; first lateral sinus very deep, elongate-conical, very acutely angular at the extremity, and arched or obliquely curved toward the umbilical side; second lateral lobe of much the same form as the divisions of the siphonal lobe, but a little· shorter; second lateral sinus wider than the lateral lobe, but more shallow, and merely forming a broad, forward arch to the umbilicus. Surface of the internal cast without nodes, costae, or angles.
"Greatest diameter of a specimen with the body chamber broken away, 3.07 inches; convexity, 0.87 inch; breadth of outer volution, measuring in the direction of the plane of the shell, 1.72 inches.
"Excepting in being more compressed, with a narrowly rounded periphery, this species has much the general appearance externally of G. rotatorius de Koninck. Its septa are more closely approximated, however, and differ remarkably in having the siphonal lobe so enormously developed, and so wide and deeply divided as to lap over on the sides far enough to cause its large, acutely pointed terminal branch, on each side, to appear in a side view like the first lateral lobe, while the first lateral lobe is thus, as it were, crowded much farther inward, and appears like a second lateral lobe. From this structure the fossil looks very much as if there were two large, sharply angular lateral lobes where there is really only one."
The specimen in hand appears to fit this description exactly, The diameter of the outer volution is (measured radially) 39 mm.; the convexity at this point is 22 mm. The surface of the shell is smooth or nearly so.
Horizon and locality. Drum limestone, oolitic member, at Kansas City, Mo., and Cherryvale (station 40), Kan.
Family Glyphioceratidae
Genus SCHISTOCERAS Hyatt.
Schistoceras missouriense (Miller and Faber).
(Pl. XXI, figs. 4-4a.)
1892. Goniatites missouriensis. Miller and Faber, Jour. Cinn. Soc. Nat. Hist., vol. 14, p, 164, pl. 6, fig. 1.
1903. Schistoceras missouriense. Smith, Monog. U. S. Geol. Surv., vol. 42, p. lll, pl. 8, fig. 1. [available online]
Smith's description: "Shell subglobose, involute, whorls highly arched, helmet shaped, sides somewhat flattened, about twice as high as broad, deeply embracing, showing but little of the inner whorls, and deeply indented by them. Umbilical shoulders abrupt and umbilicus is deep and rather narrow, being hardly one-fourth the total diameter. Surface apparently smooth, no constrictions being visible. The preservation of the cast does not permit the determination of the presence or absence of umbilical ribs.
"Septa consisting of four lateral lanceolate lobes on each. side, and probably a fifth on the umbilical border. The saddles are also like the lobe, but more constricted and club-shaped. The form and septa are unmistakably those of Schistoceras, and the species may very likely be identical with either S. hyatti or S. hildrethi, but the figures and description of S. missouriense do not permit this determination. It seems to be more compressed and to have a narrower umbilicus than either of the other species."
The umbilicus on this shell is quite wide, being a little more than one-fourth the total diameter of the shell. There is a small ventral ridge around the periphery. The ventral lobe is long, fairly broad, and divided by a siphonal saddle of nearly equal breadth. There are at least two more lobes on the umbilical border. The type specimen of S. missouriense is cut through the middle in the plane of the. shell, and so these latter characteristics are not observed. It is also somewhat larger than the specimen at hand and seems to be somewhat more compressed near the aperture. It is worthy of note, however, that this character is one developed rather later in the life of the animal, and that this may really be of no specific importance, as the shell at hand shows a tendency to develop the same character. Surface marked with numerous fine revolving lines, rather closely set and rather strong. Crossing these, and much finer, is another set of growth lines which, together with the others, serve to give a more or less concellated appearance to the shell. It is very similar to S. hyatti, and probably a close comparison of a large number of specimens will prove the two identical.
Horizon and locality. Drum limestone, oolitic member, Kansas City, Mo., and Cherryvale (station 40 ?), Kan.
Trilobita
Family Proetidae
Genus PHILLIPSIA Portlock.
Phillipsia major Shumard.
(Pl. XIX, figs. 6-8.)
1858. Phillipsia major. Shumard, Trans. St. Louis Acad. Sci., vol. I, p. 226.
The specimens studied include several pygidia, varying in size, associated with more or less complete cranidia and one pygidium with the thorax (somewhat broken) and cranidium attached, and three free cheeks. From these specimens the following description is given:
General outline elliptical, cephalon (without genal spines) about two-thirds as long as the pygidium and considerably wider.
The length of the cephalon is about equal to the width of the cranidium, which equals a little more than half the entire width of the cephalon; with the genal spines, the length of the cephal on is about equal to its width. The cranidium is slightly longer than wide, and the width in front is equal to the width at the eyes. The glabella is subrectangular in outline, with the sides converging slightly toward the front, anterior margin rounded; moderately convex, the greatest convexity being slightly behind the middle. It is sharply defined, being margined by a small but distinct groove on each side and another one in front, which separates it from the flattened anterior border. Glabellar furrows in three rather obscure pairs, the posterior pair being strongest and passing obliquely backward across the lateral angles of the glabella so as to divide it at the neck ring into three nearly equal parts. Two fainter pairs of furrows extend obliquely backward on the glabella. Neck ring prominent, narrow, extending laterally a short distance due to the rapid divergence of the facial suture. Neck furrow deep and narrow. Palpebral lobes moderately large and sharply defined. In the furrows which define the sides of the glabella, situated about one-third the length from the front, is a sharp, deep pit on each side of the glabella. The free cheeks are subtriangular in shape, produced at the genal angles into long spines; outer border flattened and defined from the interior by a shallow groove which is parallel to the margin, while another groove parallel to the posterior margin extends inward to connect with the neck furrow. Between these two grooves the cheek is somewhat raised and convex to the margin of the eye, which rises abruptly from it. Eyes large, lunate.
Pygidium subtriangular in outline, the width being a very little greater than the length, tapering rapidly from the anterior side of the abruptly rounded posterior extremity; side nearly straight. Border smooth, flat or concave at the posterior end and becoming narrower and somewhat sloping anteriorly. Axial lobe about two-thirds as wide as the pleural lobes on the anterior end, but all three narrow down to blunt points toward the posterior extremity. The axis is defined by a very deep, narrow groove on each side, and is composed of twenty-two segments while each of the pleaural lobes has twelve.
The surface is smooth in appearance, but when examined with a lens is seen to be very finely pitted.
This species agrees so well with Shumard's description that there can be little doubt that the identification is correct. He gave as the dimensions of the pygidium: "Length, 1.1 inch; breadth, 1.2 inch." On the largest of the pygidia at hand the dimensions are: Length, .99 inch; breadth, 1.02 inch. Whether it is identical with Meek's specimen is somewhat doubtful, for comparing the length and breadth of about twenty pygidia in these collections reveals the fact that all of them are wider than long.
This is the species described by Hall as Proetus longicaudus and originally believed to be from the Devonian, but subsequently referred by him to the Carboniferous. A cast of the type is identical with the present fossils, even to the small pit on each side of the glabella, which for some reason he did not describe.
This species differs from P. sangamonensis, as described by Girty, from the Wewoka formation, in the pit on each side of the glabella, in the straight instead of sinuous sides of the glabella, and in the fact that the width of the anterior part of the cranidium is equal to the width at the eyes.
Horizon and locality. Drum limestone, oolitic member, at Turner, Elsmore (station 46), Cherryvale (station 40) and Independence (stations 12, 23), Kan., and Kansas City, Mo.
Prev Page--Species Description, continued || Next Page--Localities, References
Kansas Geological Survey, Geology
Placed on web Dec. 27, 2017; originally published June 15, 1930.
Comments to webadmin@kgs.ku.edu
The URL for this page is http://www.kgs.ku.edu/Publications/Bulletins/17/03_species2.html