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University of California Publications in Geology [Vol. 9 



The physical conditions under which the Cedar Mountain beds were 

 deposited do not suggest a predominantly forested or brushy region, 

 though both trees and brush were presumably present. It may be 

 that grazing was relatively better elsewhere, and that Merychippiis 

 was abundant in regions not far distant. 



HYPOHIPPUS (DRYMOHIPPUS) NEVADENSIS Merriam 



Hypohippus (Drymoliippus) nevadensis Merriam, Univ. Calif. Publ. Bull. 

 Dept. Geol. vol. 7, p. 420, 1913. 



Type specimen no. 21056, University of California Collections in Vertebrate 

 Palaeontology. From the Cedar Mountain beds, in Stewart Valley, twenty-four 

 miles northeast of Mina, Nevada. 



Characters much as in Hypohippus, but metaloph of milk molars not con- 

 nected with ectoloph. 



Type specimen a small portion of the skull with three milk molars, portions 

 of all four limbs, and a number of scattered fragments of other skeletal parts. 



Skull and Dentition.— All that remains of the skull consists of a 

 portion of the lower region of the cranium. The part of the cranium 

 present exhibits little of significance. 



The dentition of the type skull shows three well-preserved cheek- 

 teeth. The incisors are not present. The cheek-teeth represent the 

 milk dentition with Dm 4 just coming into function. The teeth rep- 



Fig. 18. Hypohippus (Drymohippus) nevadensis Merriam. Upper milk 

 molars, outer and occlusal views, no. 21056, natural size. Cedar Mountain beds, 

 Nevada. 



