236 



University of California Publications. [Geology 



throwing some light on the age of the Virgin Valley beds. These 

 specimens are listed and described below. 



HYPOHIPPTJS ? EQUINUS (Scott). 

 Fig. 1. 



A portion of a right lower jaw, containing the milk molars 

 and the first permanent molar (no. f0665, Univ. Calif. Col. Vert. 

 Palae.), may be referred provisionally to Hypohippus equinus, 



Fig. 1. — Hypohippus ? equinus (Scott). Portion of a right lower jaw with 

 milk molars and first permanent molar. A, occlusal view ; B, lateral view. 

 No. 10665, natural size. 



which it about equals in size. The teeth, however, as indicated 

 by the single permanent molar preserved, are apparently some- 

 what higher crowned than those of the type of the Deep River 

 species. But this apparent difference may be due in part to the 

 considerable degree of wear in the latter, while, in the specimen 

 from Virgin Valley, m 1 although completely formed is entirely 



