370 University of California Publications in Geology [ VoL - 7 



A jaw fragment with M 1 and P 4 (no. 13843) obtained by 

 Matthew and Cook 3 at Snake Creek, Nebraska, is doubtfully re-' 

 ferred to Tephrocyon. It represents a form, one half larger than 

 T. hippophagus. The heel of M x in this form seems shorter than 

 in any other specimen referred to Tephrocyon, 



Figs. 15a and 15i>. Tephrocyon?, compare rurestris (Condon). No. 

 12503, natural size. Virgin Valley Beds, Little High Rock Canyon, Humboldt 

 County, Nevada. Fig. 15a, M and inner view; fig. 156, M i occlusal 

 view. 



Figs. 16a and 16b. Tephrocyon ?, sp. No. 12504, natural size. Virgin 

 Valley Beds, High Rock Canyon, Humboldt County, Nevada. Fig. 16a, 

 outer side; fig. 16b, occlusal view. 



A jaw fragment with M, and P 4 (no. 12503) from the Middle 

 Miocene of Little High Rock Canyon, Humboldt County, Nevada, 

 is compared with Tephrocyon rurestris by Merriam. 4 The gen- 

 eral form and measurements are near those of the type specimen 

 of T. rurestris. The metaconid of M, seems relatively a little 

 smaller and the protoconid and paraconid more acute. This 

 difference, especially as represented in the figure, is largely due 



s Matthew, W. D., and Cook, H. J., Bull. Am. Mus. Nat. Hist., vol. 26, 

 p. 376, 1909. 



* Merriam, J. C, Univ. Calif. Publ. Bull. Dept. Geol., vol. 6, p. 239 

 and 240. text-figs. 8a and 8b, ]911. 



