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University of California Publications in Geology [Vol. ll 



The maxillary fragment shows no important characters. The 

 infraorbital foramen is immediately over the anterior border of P 4 . 



Measurements of no. 21507 



P 3 , transverse diameter of heel 9 mm. 



P 4 , anteroposterior diameter 32.3 



P 4 , transverse diameter across protoeone — 15 



M 1 , anteroposterior diameter 21.4 



M 1 , transverse diameter 28.7 



M 2 , transverse diameter 18.2 



Figs. 144a and 1446. Aelurodon? aphobus, n. sp. Upper jaw with P 4 , M 1 , and 

 M 2 , no. 21507, natural size. Pig. 144a, lateral view; fig. 1446, occlusal view of 

 teeth. Eicardo Pliocene, Mohave Desert, California. 



This form shows some resemblance to Dinocyon, but M 2 is smaller 

 and P 4 narrower. It differs from Aelurodon wheelerianus in the 

 larger size, less prominent protostyle and deuterocone of P 4 ; larger 

 inner lobe of M 1 ; and larger M 2 . From A. saevus it differs in the 

 much smaller deuterocone of P 4 ; longer and heavier protoeone lobe 

 of M 1 ; and larger M 2 . 



Cams? ursinus described by Cope, 38 from a lower jaw obtained 

 from the Santa Fe marl is a canid with large M 2 and M 3 . The upper 



38 Cope, E. D., IT. S. Geol. Surv. West of 100th Meridian, vol. 4, p. 304, pi. 69, 

 figs. 1 to lb, 1877. 



