1913] Merriam: Notes on the Canid Genus Tephrocyon 369 



The specimen from the Cedar Mountain region of middle 

 Nevada referred to above consists of the greater portion of a 

 single lower carnassial (see fig. 10) from Stewart Valley (local- 

 ity 2027). It is almost identical in form with M 3 of the type 

 specimen of Tephrocyon kelloggi from Virgin Valley, Nevada. 

 The very slight differences between these two specimens are due 

 in a large part to the fact that the Stewart Valley specimen is 

 unworn, while the type has been subjected to moderate wear. 



In addition to showing closely similar dimensions, the Stew- 

 art Valley specimen resembles M, of the type of T. kelloggi in 

 the very long heel, and the very large metaconid. There is also 

 close cori'espondence in a number of minor details, as in the posi- 

 tion and form of the small inner and outer tubercles intermediate 

 between trigonid and talonid. the presence of a faint ridge of 

 the cingulum on the outer side of the heel, and the development 

 of a faint ridge on the outer portion of the posterior end of 

 the heel. 



Comparative Measurements 



No. 19767 T. kelloggi 

 M , anteroposterior diameter of heel on inner side.. 4.3 mm. 4.1 

 M jt greatest transverse diameter of heel 6.5 7. 



Species op Uncertain Relationships 

 Several fragmentary specimens representing forms in or 

 near Tephrocyon have been described in recent palaeontologic 

 papers. The exact position of the forms represented by this 

 material can not be satisfactorily determined until better speci- 

 mens are obtained. 



Fig. 14. Tephrocyon?, sj>. Part of lower jaw with and M^. 

 External view X %, occlusal view of teeth natural size. (Amer. Mus. Nat. 

 Hist,, no. 13843). (After Matthew and Cook). 



