176 H. S. Lull — The Evolution of the Horse Family. 



plexity of the grinding teeth. Miohippus, which may have 

 existed into the Miocene, is contemporaneous with the Euro- 

 pean Anchitheriuni, a similar genus, to which the species of 

 Miohippus were formerly referred. The European genus is 

 a derivative of the latter. Miohippus anceps and M. annec- 

 tens were hoth described by Marsh, and the types are in the 

 Yale Museum. In addition there is a perfect skull from the 



11 



b 



Fig. 11. a, Fore foot and b, hind foot of Hypohippus equinus ; drawn 

 from casts from the American Mnseum of Natural History. One-fourth 

 natural size. (Original.) 



Middle John Day (green beds), probably referable to M. anceps. 

 The collection contains the fore and hind feet and numerous 

 skeletal elements. The John Day types are confined to 

 Oregon. 



