1887] The Perissodactyla. 1003 
with the extinct genera of the Old World, Ccelodonta and 
Elasmotherium. In the latter the molars became prismatic, and 
the vertical enamel-plates vertically plicate. 
and from side; and atlas and axis, the latter from above, side, and below; from 
White River Miocene of Colorado. Original. 
the John Day, Miocene ages. Both were numerous in individ- 
* Aphelops did not develop a horn. Dee a 
1 
z es * 
For an illustrated account of this genus, see NATURALIST, 1879; P- 775 % 
VOL. XXI.—nNo, 11, 68 : eee 
