PLATE XX. 



Fig. 21. Procamelus (?) 



A first or second upper molar of tho left side, view of thi; triturating surface. Specimen 

 found iu associatiou with those of Fig. 14, 1.5, aud 17, in Washiugtou Couuty. 



Fig. 22. Astragalus of tho left side, upper view, probably of the same species as the last, and found 

 with it. 



Fig. 23. HlPPAI!ION(?) I'AUVIILUS 



A coronary boue, or second phalanx, of the natural size. Fonnd at Antelope, Nebraska. 



Fig. 24. FeLIS AUGUSTUS ? 



Distal extremity of the right humerus, front view, one-half size. Specimen found on tho 

 Niobrara River, by Professor Hayden. , 



Figs. 25, £6. Hyraciivus aguarius. From a specimen obtained by Dr. Carter at Grizzly Buttes. 

 Natural size. 



Fig. 25. Left ramus of tho lower jaw, containing the back two premolars and the two suc- 

 ceeding molars. 



Fig. 26. View of the triturating surface of the same teeth, with the addition of part of the 

 second premolar. 



