180 i?. S. Lull— The Evolution of the Horse Family. 



section and entirely free in all stages of wear. Neohipparion 

 is abundantly represented in the Yale collections, was about 

 forty inches in height at the shoulder, of deerlike aspect, and 

 like the deer admirably adapted for speed. 



In the Old World this horse is represented by its descendant 

 llipparion, ranging from the Pikermi beds, which are of 



14 



Fig. 14. a, Fore foot and b. hind foot of Neohipparion ivhitneyi ; drawn 

 from casts from the American Museum of Natural History. Protohippus is 

 in the same stage of evolution. One-fourth natural size. (Original.) 



equivalent age with the Upper Loup Fork, to the Middle 

 Pliocene. Hipparion gracile, found in Greece, is also a 

 three-toed horse, though much larger than its American pro- 

 genitors. This species is represented in the Yale collection by 

 an admirable skull, jaw, and feet and limb bones, from the 

 Museum of the University of Athens. 



