PLATE V. 



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



The same tooth, viewed from below. 



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



Page 44. 

 The same specimen viewed from above. 

 The same specimen viewed from the fr->nt. 

 Megacerops assiniboiensis, Lambe ; left mandibular ramus, outer aspect ; one-half 



the natural size. Type. Page 51. 



c, canine ; L, incisor ; P2, second premolar. 



