368 University of California Publications in Geology L VoL - 7 



Thousand Creek, Nevada, closely approaches this species, and a 

 lower carnassial from Cedar Mountain in middle Nevada repre- 

 sents a closely allied form. 



This species differs farther from all of the other three species 

 than any one of these three differs from the others and further 

 study may suggest subgeneric separation. The mandible is more 

 slender than in T. rurestris or in T. Mppophagus; the premolars 



Figs. 9a and 9b. Tephrocyon kelloggi Merriam. Type specimen, X 1%. 

 No. 11562. Virgin Valley Beds, Virgin Valley, Nevada. Fig. 9a, M and 

 lateral view; fig. 9b, superior view. 



Fig. 10. Tephrocyon , near kelloggi Merriam. M , no. 19767, X 1%. 

 Stewart Valley Beds, Nevada. 



are relatively smaller, more simple, and more widely spaced than 

 in the other forms; M._, and the heel of M 1 are relatively long; 

 and the metaeonid of M, is unusually large and high. The char- 

 acters of the jaw and dentition are in general those of Tephro- 

 cyon, and the species is evidently nearer the group of three 

 including T. rurestris, T. temerarius, and T. hippophagus than 

 to any other known dogs. 



11a 



Figs. 11a and lib. Tephrocyon kelloggi Merriam. M , unworn tooth, 

 no. 10651, X Wo. Virgin Valley Beds, Virgin Valley, Nevada. Fig. 11a, 

 outer side; fig. lib, superior side. 



Fig. 12. Tephrocyon kelloggi Merriam. M, worn tooth, no. 11474, 

 X l x /l>. Virgin Valley Beds, Virgin Valley, Nevada. 



Fig. 13. Tephrocyon, near kelloggi Merriam. M , no. 12542, X 1%- 

 Thousand Creek Beds, Thousand Creek, Nevada. 



