534 University of California Publications in Geology [Vol. 11 



shelf, and a minute anterior basal tubercle. Unfortunately the molars 

 are all imperfect. On M 1 the metaconid is well developed, the hypo- 

 conid is large and distinctly compressed laterally, the entoeonid is 

 relatively small but prominent. A fragment of a jaw apparently 

 representing this species contains a portion of M 2 , and a small, two- 

 tubercled M v 



138a 



139c 



Figs. 138a and 1385. Canid, small, near Canis? vafer Leidy. Mandible, 

 no. 22319, natural size. Fig. 138a, lateral view; fig. 1386, dorsal view. Ricardo 

 Pliocene, Mohave Desert, California. 



Figs. 139a to 139a'. Aelurodon or Tephrocyon, sp. D. Upper and lower teeth, 

 no. 22320, natural size. Fig. 139a, P 4 , outer view; fig. 139b, P 4 , occlusal view; 

 fig. 139c, jaw fragment with P 2 and P 4 ; fig. 139a", heel of M x . Eicardo Pliocene, 

 Mohave Desert, California. 



Until we can examine material with complete lower carnassial, and 

 showing more fully the structure of the other molars, it does not seem 

 possible to make a close reference of this interesting little canid. 



