UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 4, No. 7, pp. 145-161, Pis. 19-23 ANDREW C. LAWSON, Editor 



NEW MAMMALIA 



FROM. THE 



QUATERNARY CAVES OF CALIFORNIA 



BY 



William J. Sinclair. 



contents 



Introduction 



Thomomys microdon, n. sp 



Aplodontia major fossilis, n. sub-sp 



Teonoma spelaea, n. sp 



Platygonus ( ?), sp 



Camel remains 



Euceratheriurn eollinum F & S 



Aploeerus montanus Ord 



Nothrotherium( "?) shastense, n. sp 



Megalonyx sierrensis, n. sp 



Megalonyx ( ?), sp 



Megalonyx wheatleyi Cope(?) 



Megalonyx jeffersonii Leidy (?) 



INTRODUCTION. 



The cave explorations conducted by the Department of 

 Anthropology of the University of California have opened to 

 the palaeontologist a new source of information regarding the 

 Quaternary vertebrate fauna of this state. Occasional scattered 

 teeth and bones from valley alluvium, clay beds, stream gravels 

 and asphaltum deposits of Quaternary age occurring in various 

 parts of California, have shown the presence of a considerable 

 variety of mammalian species, but it has been impossible to 

 group them into a fauna which might be regarded as a chrono- 

 logic unit, owing to more or less variation in the age of these 

 beds. The agencies involved in the accumulation of most of 



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