UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 5, No. 26, pp. 397-403 ANDREW C. LAWSON, Editor 



AN APLODONT RODENT 



FROM THE 



TERTIARY OF NEVADA. 



BY 



EUSTACE L. ELTELONG. 



CONTENTS. 



PAGE 



Introduction 397 



Diagnostic characters 398 



Superior dentition 400 



Inferior dentition 401 



Maxillaries, 402 



Generic position and affinities 403 



INTEODUCTION. 



In Juno, 1906, Professor John 0. Merriam of the University 

 of California visited the region of Virgin Valley in northwestern 

 Nevada, and obtained a small collection of mammalian remains 

 representing the fauna of an extensive Tertiary formation ex- 

 posed in that locality. This fauna was considered by Professor 

 Merriam 1 to represent the Miocene. The upper division was 

 presumed to correspond to a stage of the Miocene not older than 

 the Mascall beds of the John Day region. The fauna of the 

 lower horizon was considered as Miocene, though the particular 

 stage was not determined. 



i Science, N. S., vol. 26, p. 380. 1906. 



