1899-] IVortinaii and Matthew, Ancestry of tJie Canidcs, etc. I I^ 



of which the crown of the fourth is preserved, show little or no 

 reduction, differing in this respect from the preceding species in 

 a marked degree. The second molar, whose crown is preserved 

 in perfect condition, has a squarish outline with low tubercular 

 cusps ; the trigon is very slightly raised above the heel, and the 

 anterior cusp is much reduced. The last molar was distinctly 

 two-rooted. The length of the molars and premolars is 38 mm. 



There are five specimens of lower jaw fragments in the collec- 

 tion from the Big Horn Wasatch which agree very closely with 

 the above type and which we provisionally refer to this species. 

 The premolars were apparently unreduced, the jaw of the same 

 ■depth and shortness, and the last molar strongly two-rooted. In 

 one specimen (No. 4224), however, the anterior portion of the 

 second molar is less elevated, and the anterior cusp of the trigon 

 more reduced than in the type specimen from the Wind River. 



Uintacyon vorax Leidy} 



This species is not represented in the Museum collection and 

 the description here given is from the type of U. bathygnathus of 

 Scott," which name is undoubtedly synonymous with that of the 

 aljove species. 



The specimen, like that of the type, is from the Bridger, and 

 consists of the greater part of both lower jaws, one of which con- 

 tains the heel of the sectorial and the second molar in perfect 

 condition. There are also present the proximal end of the femur, 

 •distal end of the tibia and fibula, part of the proximal end of the 

 ulna, distal end of radius, a complete fifth metacarpal, a part of a 

 metatarsal, and two phalanges. The original type of the species 

 consists of a fragment of the lower jaw bearing the second molar, 

 preserved in the collection of the Philadelphia Academy. 



As in the preceding species the premolars are not especially 

 reduced, and the jaw is relatively deep and short. The last molar 

 is single-rooted, and the size is considerably greater than in U. 

 brevirostris ; the length of the lower molar and premolar series 

 is 51 mm. 



The fragments of limb bones are not certainly known to belong 

 ■with the jaws, but they seem to agree so well in every respect 



' Proc. Acad. Nat. Sci. Phila. 1872, 277. 



'Some Little Known Creodonts. Jour. Acad. Nat. Sci. Phila. Vol. IX, 172. 



June, iSgg.'\ 8 



