In the National Museum collection there is a single example of a scute pertaining to some lepidotid fish (No. 1063, Kiowa shales). Cope has described Macrepistius of this family from a stratum between the Upper and Lower Trinity Sands of Texas. It seems very probable that the teeth referred to the vomer of Mesodon abrasus really belong here.
Kansas Geological Survey, Volume V1, Cretaceous Fishes
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Web version July 2004. Original publication date 1900.