UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 7, No. 23, pp. 435-441,4 text-figures Issued December 22, 1913 



NEW PROTOHIPPINE HORSES FROM 

 TERTIARY BEDS ON THE WESTERN 

 BORDER OF THE MOHAVE DESERT 



BY 



JOHN C. MEREIAM 



CONTENTS 



PAGE 



Introduction r 435 



Hipparion(f) mohavense, n.sp : 436 



Hipparion( ?), sp 440 



Protohippus( ?) tantalus, n.sp 440 



INTRODUCTION 

 Investigation of the Tertiary mammal-bearing beds in the 

 Mohave Desert, carried on by the Department of Palaeontology 

 of the University of California within the past three years, has 

 brought to light collections of unusual interest iti two localities. 

 One station is in the Barstow Syneline, north of Barstow, Cali- 

 fornia, and near the middle of the desert. The other locality 

 is in the El Paso Range on the extreme western border of the 

 desert. 



The greater part of the Tertiary mammal collection obtained 

 in the Mohave region has come from exposures in the Barstow 

 Syneline. The fauna obtained in these exposures has been 

 reported by the writer 1 as evidently representing a stage near 



i Merriam, J. O, Univ. Calif. Publ. Bull. Dept. Geo!., vol. 6, p. 169, 1911. 



