256 University Geological Survey of Kansas. 



Mesodon abrasus. 



Mesodon abrasus Cragin, Colorado College Studies, v, 1894; Williston, 

 Kans. Univ. Quart., ix, p. 29. 



"This name is proposed for certain pycnodont teeth of low, 

 rhomboidal form and feebly convex upper surface which occur 

 in No. 3 of the Belvidere section, southwest of the Belvidere 

 railroad station, and seem to agree with the large mandibular 

 teeth of Mesodon. The specific name refers to the occurrence 

 in the type species of two small, oblique facets produced at one 

 end by attrition. The type has a height (above root) of 3 mm., 

 a length of 13 mm., and a breadth of 5 mm. 



' c To the vomerine set of the same species may belong the 

 rotund, oval or nearly hemispherical teeth of similar height 

 but smaller size, which occur not uncommonly at the same 

 locality and horizon, the largest now available example of 

 which measures about 6 and 7 mm. in major and minor hori- 

 zontal diameters." 



In the National Museum collection there are several teeth, 

 occurring singly, corresponding to the vomerine teeth described 

 by Cragin. That they belong with the other teeth there de- 

 scribed is very doubtful — indeed it is doubtful whether the other 

 teeth belong with Mesodon, since it is impossible to locate the 

 genus from single teeth. It is not at all impossible that the 

 vomerine teeth are identical with Cope's M. diastematicus. The 

 larger teeth may be the same as those of either the above- 

 described species of Ccelodus. 



The largest of the specimens in the present collection meas- 

 ures 10 by 7{ mm. ; several smaller examples have diameters 

 of 6 and 5 mm. ( See plate XXX, fig. 4.) 



LEPIDOSTEIDiE. 



Lepidotus, sp. 



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. 



