UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 4, No. 6, pp. 125-143, PlS. 14-18. ANDREW C. LAWSON, Editor 



NEW OR IMPERFECTLY KNOWN 

 RODENTS AND UNGULATES 



FROM THE 



JOHN DAY SERIES 



BY 



William J. Sinclair. 



contents. 



PAGE 



Introduction 125 



Peromyseus parvus, n. sp 126 



Entoptychus sperryi, n, sp 126 



Entoptychus rostratus, n. sp 128 



Hypertragulus, sp 128 



Allomeryx planieeps, n. gen. and sp 129 



Elotherium calkinsi, n. sp 132 



Thinohyus (Bothrolabis) deeedens Cope 134 



Thinohyus (Bothrolabis) osmonti, n. sp 138 



Mesohippus acutidens, n. sp 141 



INTRODUCTION. 



In the mammalian collections obtained in the John Day 

 region by the University of California parties of 1899 and 1900 

 there are a nnmber of forms which are new to science, and others 

 which have been only imperfectly described. Of these collections 

 Professor Merriam has turned over to the writer the ungulate 

 and rodent material for study and description. 



In the following paper no attempt is made to discuss the rela- 

 tions of the faunas with which the described species are associ- 

 ated. In a later article by Professor Merriam and the writer, 

 there will be presented a general discussion of the relations of the 

 series of mammalian faunas known in this region. 



