Cope.] 86 [Feb. 17, 
The above four propositions cover the principal peculiarities of the den- 
tition of the Coryphodontide. I now proceed to a consideration of those 
of the UINTATHERIIDA. 
Fra. 4.—Coryphodon latidens Cope, lower jaw, one-third natural size, from the Wasatch, 
epoch of New Mexico. Fig. a, right ramus from internal side. Fig. 6, both rami from 
above. Original, from Report U.S. G.G. Surveys W. of 100th Mer., G. M. Wheeler in: 
charge. This specimen has an anomalous premolar. 
As is well known, the crowns of the superior molars in this family sup- 
port two cross-crests, which converge and nearly join at the internal extrem- 
