PLATE V. 



Fig. 1. Aceratherium sp.; left upper first premolar, outer aspect. Cypress hills, 1904. 



Fig. 2. The same tooth, viewed from below. 



Fig. 3. Aceratherium exiguum, Lambe ; anterior end of mandible, left outer aspect. Type. 



Page 44. 

 Fig. 4. The same specimen viewed from above. 

 Fig. 5. The same specimen viewed from the fr^nt. 

 Fig. 6. Megacerops assiniboiensis, Lambe : left mandibular ramus, outer aspect ; one-half 



the natural size. Type. Page 51. 



c, canine ; i., incisor ; P?, second premolar. 



