I 14 Bulletin American Mitseiini of Natural History. [Vol. XIV, 



The teeth of the type specimen are little worn and hence the 

 simplicity of the enamel folding is not due to age. A feature 



p4 



Fig. 9. Equus c.xccls7is'Le\&y. Type. ^, crown 

 view of upper first, second, and third molars, and 

 fourth premolar. A ', anterior view of p*. 



shown in this specimen which may 

 distinguish it from the other species 

 of its size is the extreme anterior 

 position of the postpalatal foramen 

 and the anterior extension of the 

 palatal notch. These are placed 

 about 15 mm. farther forward than 

 in any of the Nebraska specimens of 

 the same size in the American Mu- 

 seum collection, and indeed their 

 position is more anterior than in 

 even very young individuals of the 

 domestic horse. However, to make 

 this character a strong distinguishing 

 feature, it would be desirable to 

 obtain several other specimens from 

 the same locality showing this same 

 character. 



(9) Equus occidentalis Lcidy. 



Type Locality. — Tuoliimne Co., California. 



Type. — Superior p^. 



Autho/s Description.— \xi describing the teeth from California Leidy said : 

 "Two of them are second upper molars of different individuals. . . . 

 These two upper molars, strongly resembling each other, differ from the more 



