Douglass : X'ertebrates from Montana Tertiary. 195 



I include this provisionally under Dinocyo/i on account of the num- 

 ber of upper molars, and the shortness of the face. 



Measurkmknts. 



Mm. 



Length of the last 3 premolars and the 2 molars 1 26 



Length of V- 17 



Width " ■' II 



Length of P' 23.5 



Width " " 15 



Length of P^ 35 



Width " " 23 



Length of Ml 30 



Width " " 41 



Width of occipital condyles 72 



" " foramen magnum 28 



PERISSODACTYLA. 



Aphelops? ceratorhinus sp. nov. 



No. 857. Figs. 2>Z, 34 and 35. 



Part of the skull, mandible and limb bones of one individual were 



found together, in the Lower Madison valley, about five miles south 



of the town of Logan. Other portions of skeletons were obtained 



Fig. 34. Aphelops ? ceratorkintts (No. S^T). Nasals. Loup Fork, i natural size. 



which may belong to the same species, but they are not now accessi- 

 ble. 



Size large. Nasals long, heavy, and horn-bearing. Molars and 

 pi with anterior process to posterior cross-crests. PJ- small, the others 



