UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 9, No. 1, pp. 1-8, 5 text-figures Issued June 29, 1915 



NEW SPECIES OF THE HIPPARION GROUP 

 FROM THE PACIFIC COAST AND GREAT 

 BASIN PEOVINCES OF NORTH AMERICA 



BY 



JOHN C. MERRIAM 



CONTENTS 



PAGE 



Introduction 1 



Neohipparion gidleyi, n. sp 1 



Neohipparion molle, n. sp 3 



Neohipparion leptode, n. sp 3 



Hipparion platystyle, n. sp 5 



Hipparion condoni, n. sp 6 



INTRODUCTION 



In recent studies of Tertiary faunas occurring in the region west 

 of the Wasatch Range several species of the Hipparion type have 

 appeared which seem distinct from any thus far described. As this 

 group has considerable importance in discussion of the West American 

 Tertiary and reference to the species is necessary in papers in which 

 specific descriptions seem not properly included, it is deemed desir- 

 able to present a brief statement of the characters of the new forms 

 at this time. 



NEOHIPPARION GIDLEYI, n. sp. 



Type specimen, an upper molar three, no. 21382. Probably from a stratum 

 just below the coal seam at a mine on the Lawler Ranch, six miles east of 

 Petaluma, California. The formation has been doubtfully referred to the San 

 Pablo Miocene, but may represent a later period. 



