PLATE XXYd. 



Figs. 1-2. — Stypolophus whitia;. Skull, natural size, from tho Big Horn Basin, Wyouiing; posterior region 

 restored from a skull of St. cat/lusi Filliol ; lig. 2, posterior view of right mandibular ramus. Page 

 i;92. 



Fig. 3. — DeUatheriumfuiidaminia. Left mandibular ramus, natural size, from New Mexico ; a, inner side ; 

 6, superior view. Pago 278. 



Figs. 4-.5. — THdijmictis protenus. From the Big Horn, natural size. Page 311. 



Fig. 4. — Maxilhiry bone support iu last four molar teeth, from below: a, from left side. 



Fig. 5. — Mandible of the same species, from aViove. 



Fig. 6. — Didymictis leptomjilus. Larger variety, portion of left Miaudil>U', from above. Page 309. 



