Marsh Collection, Pedbody Museum. 



201 



vus gracilis. The principal points of similarity are seen in 

 the two-rooted first premolar, which is characteristic of all 

 the Bridger species of Viverravus, the form of the premolars, 

 and the agreement in size. The name may, therefore, I think, 

 be properly placed as a synonym of V. gracilis. 



Harpalodon sylvestris Marsh.* 



This small species of Carnivore was founded upon a frag- 

 jaw, figure 38, supporting the third and 



ment of a left lower 



38 



Figure 38. — Portion 

 of left lower jaw of Har- 

 palodon sylvestris Marsh; 

 outside view; three 

 halves natural size. 

 (Type.) 



fourth premolars and a part of the crown of the first molar or 

 sectorial, including the complete heel. The structure of the 

 premolars agrees most nearly with those of Uintacyon edax. 

 The heel of the sectorial is somewhat less 

 trenchant, having the inner portion 

 slightly developed so as to form an incip- 

 ient basin. The jaw is broken below so 

 as not to display its character very well, 

 yet it has the appearance of being much 

 more slender, though lacking the thick 

 heavy structure of this latter species. 

 When more fully known, this may prove 

 to be a distinct form. With the present 

 material, however, I am persuaded that the 

 best course to pursue is to place it in the 

 doubtful list, since there are no characters 

 by which it can be properly placed or distinguished. 



A second species of this genus, II. vidpinus, founded upon 

 a lower jaw fragment, figure 39, containing the last premolar, 

 I think clearly belongs to Viverravus gracilis, and I have no 

 hesitancy in placing it in this category. 



Family Palceonictidce Osborn and Wortman. 



Palceoniclidoi Osborn and Wortman, Bull. Amer. Mus. Nat. Hist., vol. iv, no. 

 1, 1892. 



A family of little known, primitive Carnassiclents placed 

 ancestral to the Felines, ranging in time from the Wasatch to 

 the Bridger inclusive, and charac- 

 terized by the early and rapid 

 reduction of the molar dentition, 

 the short face, and cat-like lower 

 jaw. " 



Of this family, three genera are 

 known, of which Palceonictis 

 comes from the Wasatch of Europe 



and America, AmblyctomiS from lower jaw of Harpalodon vulpinus 



the Wasatch of New Mexico, and M * rsh j outside view; three halves 



jpj ,7 • r ,i -r» 'i natural size. (Type.) 



^± Lurotlierium from the Bridger. 



*This Journal, vol. iv, August, 1872, p. 25, separata. 



39 



Figure 39.— Fragment of left 



