94 Mr. E. D. Cope on the 



Amphicyon, Lartet. 



This genus is better represented in Europe than in North 

 America, but two species being certainly known from the 

 latter. No recent species. 



Thous, Gray. Dusi'cyon, Smith (nomen nudum). 

 Existing species of South America only. 



Pal^oCYON, Lund. 

 Extinct species of South America only. 



Lycaon, Brooks. 

 Existing species of Africa only known as yet. 



Temnocyon, Cope. 



(Proceedings Amer. Philosophical Society, 1878, p. 68.) 



In this genus the heel of the inferior sectorial tooth rise3 

 into a single more or less median crest ; in Cams the corre- 

 sponding front is basin-shaped, with tubercles on each side. 

 The superior molars of the typical species (T. alligenis) are 

 unknown ; but those of a new species, described below, do not 

 differ from those of the genus Cam's. The Cynodictis crassi- 

 rostris of Filhol, from the French Phosphorites, approaches 

 this genus. 



Temnocyon coryphceus, sp. nov. 



This is the most abundant dog of the Truckee beds of the 

 John-Day country. I have identified it heretofore as my 

 Canis Uartshornianus ; but I find, on examination of the infe- 

 rior sectorial tooth, that it is a species of Temnocyon. This 

 genus was characterized by me on evidence furnished by a 

 mandible of a species which I named T. altigenis *, which is 

 of considerably larger size than the present one, but which 

 agrees with it in the presence of a cutting-edge instead of a 

 basin on the heel of the inferior sectorial. The C. Harts- 

 liornianus, known as yet from few fragments, is intermediate 

 in dimensions between these two. 



Several crania and more or less of the skeleton of the T. 

 coryphceus are present in my collection. A nearly perfect 

 skull displays the following characters : — The orbits are en- 

 tirely anterior to the vertical line dividing the skull into 

 halves ; and the muzzle is proportionately shortened. It is 

 also narrowed anteriorly ; and its median line above is shal- 

 lowly grooved. The interorbital region is greatly convex to 



* Proceedings Amer. Philosoph. Soc. 1878, viii. p. 68. 



