I20 Bulletin Atnerican Museiiin of Natural History. [Vol. XII, 



except that there is no representative of the postero-internal 

 cusp. The general appearance of these teeth is more like that of 

 many Creodonts than that of the modern Carnivora. 



The lower jaw is very dog-like in its general proportions ; the 

 symphysial region is slender and the ramus is elongated. The 

 teeth resemble those of the early Dogs, especially Cynodictis ; the 

 canine is long and pointed, being separated from the anterior 

 premolar by a short diastema. The premolars have the usual 

 form in the Canidae, with compressed pointed crowns and basal 

 cingula ; the fourth has a distinct posterior accessory cusp. The 

 sectorial closely resembles that of Cynodictis. The anterior and 

 external cusps of the trigon form an effective shearing blade ; 

 the internal cusp is large and the heel basin-shaped. The second 

 molar is similar in structure but its cusps are lower and there is 

 no distinctive blade-like shear produced by a union of any of the 

 cusps of the trigon. The last molar is much reduced, as in the 

 later Canidae. 



Some fragments of the limb bones are preserved and they in- 

 dicate, as do the teeth, a clear affinity with the early Dogs. The 

 distal end of the radius is present, but the facet is cup-shaped 



Fig 6. Vulpavus palustris Marsh. Humerus, natural size. No. 2305. 



and exhibits no distinct ridge separating scaphoid and lunar 

 facets. This is not, however, conclusive proof that the scaphoid 

 and lunar were not separate, since in Viverravus, Oxycena, and 

 other Creodonts in which these bones are distinct, the distal end 

 of the radius gives little or no indication of the facet. 



Vulpavus parvivorus ' {Cope). 



This second species is represented in the collection by a frag- 

 ment of a lower jaw from the Bridger of Wyoming, and has been 

 figured by Cope as the type of his genus Miacis. The fragment 



' Proc. Amer. Philos. Soc. Aug. 1872, 470. 



