PLATE 8 



UPPER AND LOWER TEETH OF PARAHIPPUS FROM THE MIOCENE AND LOWER PLIOCENE. 



COMPARISON OF MOLAR-PREMOLAR SERIES IN DIFFERENT MIOCENE SPECIES. 



All figures natural size. 



Upper Rosebud, S. D. Lower Miocene 1. 



Near Agate, Nebraska " " 2. 



Upper Rosebud, S. D. Lower Miocene 3. 



Deep River, Mont. Middle " 4. 



Pawnee Creek, Col. 5. 



Sheep Creek, Nebr. " " 6. 



Pawnee Creek, Col. " " 7. 



Sioux Co., Nebr. ?Lower Pliocene 8. 



Left column. 



Parahippus coloradensis prwcurrens Osborn, paratype, Amer. Mus. 12925. 

 P. nebrasccnsis primus Osborn, type, Am. Mus. 13770. 

 P. tcxanus Leidy, referred specimen, Am. Mus. 12924. 

 P. crenidens Scott, type, Princeton Mus. 10430 (drawing from cast, Am. 

 Mus. 10782). 



P. pawniensis Gidley, type, Am. Mus. 9085 (reversed in drawing). 



P. avus Marsh, referred specimen, Am. Mus. 14182. 



P. coloradensis Gidley, paratype, Am. Mus. 9412. 



P. cognatus Leidy, referred specimens, Am. Mus. 13919, 13943. 



John Day River, Ore. Middle Miocene 9. 



Cottonwood Creek, Ore. 

 Pawnee Creek, Col. 



10. 

 11. 



12. 



Right column. 



Parahippus aims Marsh, type, Yale Mus. 11281, lower teeth and jaw frag- 

 ment containing po-m2 of the right side. 



P. aims Marsh, type, Yale Mus. 11281 (m 1 reversed in drawing). 



P. brevidens Marsh, type, Yale Mus. 11274, two unworn molars, in 2 " 3 

 of the left side. 



P. coloradensis Gidley, type, Amer. Mus. 9040, an unworn m 3 of the left 

 side, and a worn molar, ?m\ of the right side. 



238 



