EVOLUTION OF THE HORSE 



[9 



while in the Upper Oligocene occurs Mesohippus intermedins as 



I )i both those animals all parts of the skeleD m 

 known, and I series oi skulls, feet, jaws, palates e1 •. is 



FIG. 2.-UPPER AND LOWER TEETH OF MESOHIPPUS BAIRDI," 

 FROM THE MIDDLE OLIGOCENE OF SOUTH DAKOTA. NATURAL SIZE 



exhibited in the counter-case, besides the specimens shown in the 

 3 ■ & feet an<l in the series of skulls. 

 S. Anchitherium. Lower MlOCENE. This stage has been 

 1 h«>th in Europe and in America. It is much like its prcde- 

 but is larger and has the crests of the teeth somewhat 

 higher and m> ire a >mplete. It probably is not in the direct line of 

 ent of the horses, but is on a side branch. A palate, jaws, 

 1 and foot-bones arc exhibited here. 

 <;. Parahippus and Hypohippus. Middle MlOCENE. In Par- 

 ahippus the tooth-crests are much higher, and the trans-. 

 ridges 1 >n the upper m< >lars are beginning t< 1 change sh. • 



• 1 pair of crescents inside the outer pair. Hypo- 

 hip; irect line ent; its teeth an- like thos 

 Anchithcriilm, by which name it has been generally called, but 

 inirnal was much larger, equalling a Shetland pony in size. A 

 the Hypohippus is shown in wall-case 15, 

 and illustral well tb ;1 chara 

 1 1 re 3, ilth ugh it is not in tl 



io, in i,,oi by Barnum Brown, 

 of the Whitne Lition. Other incom] 



HypohippU and M cry, hip' shown in the 



the feel and skull in the evolution 



m A-< It ma; 'hat in the for 



