1877. | ^*7 [Cope. 



The extremity of a humerus is expanded transversely and displays two 

 unequal condyles, separated by a shallow groove. There are no epicon- 

 dyles on the external face, but fossa? instead. 



Measurements. M. 



Width of distal extremity of humerus 086 



Antero-posterior diameter of larger, condyle of the same. .045 



Discovered by Superintendent Lucas near Canyon City, Colorado. 



LAELAPS. Cope. 

 Transac. Amer. Philos. Soc. XIV, 1869, p. 100. 



Laelaps trihedrodon. Cope. 

 . Bulletin U. S. Geol Survey, Terrs. Ill, p. 805, August 15, 1877. 

 CAULODON. Cope. 

 Paleontological Bulletin, No. 26, p, 193, Nov. 21st, 1877. 



Caulodon diversidens. Cope. 

 Loc. cit. 



Caulodon leptoganus. Cope. 



A second species of the genus Caulodon is represented by a single tooth 

 from a locality distant from that from which the G. diversidens was de- 

 rived. Another tooth found with it probably belongs to the same species. 



The best preserved tooth possesses the same general form as that of the 

 G. diversidens, but the borders of the spoon-shaped crown are thinner and 

 more acute. The convexity of the convex face of the crown does not 

 commence at these edges, but is separated from them by an open shallow 

 groove. There is a median longitudinal swelling at the middle of the length 

 of the concave face. The striking peculiarity of this species is the very 

 small amount of enamel which invests the crown. It is confined to the 

 inner face, and exists there in a thin layer, not more than half as thick as 

 in the C. diversidens, which thins out and disappears towards the edges of 

 the crown. Another peculiarity is seen in its absolute smoothness. In G. 

 diversidens the enamel, even when polished by use, shows remains of the 

 grooves. 



Measurements. M. 



Diameter of crown at base i fore and aft 015 



' transverse 019 



Diameter of crown at middle { fore and aft 01 ° 



I transverse 021 



Found by Superintendent Lncas near Canyon City, Colorado. 



COMPSEMYS. Leidy. 



COMPSEMYS PLICATULUS Cope. 



Paleontological Bulletin, No. 26, p. 195. 



Explanations op the figures will be found at the end of this volume. 



PRINTED JAN. 12, 1878. 



