174 M. R. Thorpe — Oregon Tertiary Canidce 



sectorius. I am inclined to view the latter two as prac- 

 tically the same or at most as being one a subspecies of 

 the other. In comparison with E. stenocephalias Cope, 

 the new form differs in having less expanded zygomata ; 

 nasal bones differently shaped and pointed posteriorly, 

 terminating just anterior to the postfrontal processes; 

 frontal ridges uniting just beyond the postorbital con- 

 striction; muzzle 20 per cent longer; less interorbital 

 width; shorter length of superior dental series; longer 

 sectorial ; considerably smaller M 2 ; longer and wider M 1 ; 

 less axial length. 



Fig. 4. — Enhydrocyon oregonensis, sp. nov. Holotype. X 2/3, 



12730. TYPE 

 Y. P. M. 



Fig. 5. — Enhydrocyon oregonensis, sp. nov. Holotype. X 2/3. 



The incisors of this new species are peculiar in that 

 they have accessory cusps on their internal and lateral 

 surfaces, with the exception of I 3 . I 1 has an internal 

 inferiorly bifurcated cusp, as well as a small external 

 lateral one near the tip, while I 2 , in addition to the inter- 

 nal bifurcated cusp, has a lateral cusp on each side, the 

 outside one being the larger and nearer the base. P 2 is 



