PLATE 9 



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



All figures natural size. 



These are all primitive species not far removed from Miohippus of the Upper Oligoeene, especially P. pristinus Osborn 

 of the transition beds. In P. pristinus Osborn observe the extraordinary position of the pli prefossette, similar to that 

 in Miohippus gidleyi Osborn and different from that in P. coioradcnsis pmcurrens Osborn, etc. 



Agate, Sioux Co., Nebr. 



Pine Ridge, So. Dak. 



Near Agate, Sioux Co., Nebr. 



u u 



u U U 



Pine Ridge, So. Dak. 



Lower Miocene 



Left column. 



6. P. tyleri Loomis, referred specimen, Am. Mus. 13769, lower 



teeth. 



7. Parahippus pristinus Osborn, type, Am. Mus. 12918. 



8. P. tyleri Loomis, referred specimen, Am. Mus. 13769, upper 



teeth. 



9. P. nebrascensis primus Osborn, type, Am. Mus. 13770. 

 10. P. texanus Leidy, referred specimen, Am. Mus. 12924. 



Pine Ridge, So. Dak. 

 Deep River, Mont. 

 Pawnee Creek, Col. 

 Sioux County, Nebr. 



u a 



Middle 



u u 



u u 



?Lower Pliocene 



Right column. 



1. Parahippus coioradcnsis prascurrcns Osborn type, Am. Mus. 



13018. 



2. P. crcnidcns Scott, type, Princeton Mus. 10430 (reversed in 



drawing). 



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



drawing). 



4. P. anus Marsh, referred specimen, Am. Mus. 14182. Tooth 



much worn. 



5. P. cognatus Leidy, referred specimen, Am. Mus. 14322. 



240 



