UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 7, No. 22, pp. 419-434, 5 text figures Issued December 16, 1913 



NEW ANCHITHERIINE HORSES 



FROM THE TERTIARY 

 OF THE GREAT BASIN AREA 



BY 



JOHN C. MEREIAM 



CONTENTS 



PAGE 



Introduction 419 



Hypohippus (Drymohippus) nevadensis, n. sub-gen. and n. sp 420 



Skull and Dentition 420 



Limbs 425 



Relationships 426 



Parahippus(?) mourningi, n. sp _". 427 



Upper Cheek-teeth 428 



Lower Cheek-teeth 430 



Relationships 432 



INTRODUCTION 



Within the past two years, four expeditions from the Univer- 

 sity of California have visited the southern portion of the Great 

 Basin region to search for vertebrate remains in Tertiary 

 deposits. One party investigated the region southeast of Walker 

 Lake, Nevada, in 1912, and three parties have worked in the 

 Mohave Desert area in 1911, 1912, and 1913. 



Of numerous palaeontologie contributions made by these 

 expeditions, among the most interesting is the discovery of two 

 anehitheriine horses presenting phases of structure or stages of 

 development not previously known in the groups with which 

 they are most nearly allied. 



