1877. | 247 [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 fosse 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. 8. Geol Survey, Terrs. III, p. 805, August 15, 1877. 
CAULODON. Cope. 
Paleontological Bulletin, No. 26, p, 193, Nov. 21st, 1877. 
CAULODON DIVERSIDENS. Cope. 
Loe. cit. 
CAULODON LEPTOGANUS. Cope. 
A second species of the genus Cuulodon is represented by a single tooth 
from a locality distant from that from which the C. 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 
C. 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. Thereisa mediaa 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 @. diversidens, which thins out and disappears towards the edges of 
the crown. Another peculiarity is seen in its absolute smoothness. In C. 
diversidens the enamel, even when polished by use, shows remains of the 
grooves. 
Measurements. M. 
Dinnicter of efoWn at base { fore and atten sce s Picecibeacal Les, 
LTANAVETSCAe co sleersis ces toes .019 
Dianicter ob Cima at amidale { fore and aft............ -010 
GYANSVETSEN 2s sclae elec -021 
Found by Superintendent Lucas near Canyon City, Colorado. 
COMPSEMYS. Leidy. 
COMPSEMYS PLICATULUS Cope. 
Paleontological Bulletin, No. 26, p. 195. 
EXPLANATIONS OF THE FIGURES will be found at the end of this volume. 
