Peterson: Material Discovered in Uinta Basin. 53 



Paratype: Fragment of right maxillary and jugal, right ramus with 

 canine in place, fragments of upper and lower teeth, and a consider- 

 able portion of the skeleton, C. M. No. 3006. 



Horizon: Uinta Eocene, Horizon C, near base. 



Locality: Six miles southeast of IVIyton, Uinta County, Utah. 



Generic Characters: Mandibular rami proportionally short and deep. 

 Lower molars decreasing in size from first to third, tuber culo-sectorial, 

 with long trenchant heels, low trigonids, and the metaconids of moderate 

 size. 



Description of the Type. 



In comparing some fragments of the upper teeth of the paratype, 

 No. 3006, with the description and illustrations of the superior dentition 

 of Vnlpavus and Lycarion by Wortman" and Matthew^^ it is at once 

 seen that the canine of the present form is more compressed laterally. 

 There is also a total absence of the internal and posterior ledge-like 

 elevation, which rises from the cingulum (hypocone) on the internal 

 face of the molars of Miacis and Lycarion, and in this respect it is more 

 like the condition found in Oodectes, except that the deuterocone is 

 proportionally more developed antero-posteriorly and has a tendency 

 to be sub-divided into two tubercles in the form now being described. 

 In other words, it appears that the hypo- and proto-cones have been 

 united as indicated in the illustration, PI. XXXV, Fig. 11, and that 

 there is one intermediate tubercle of small size. Whether or not there 

 were two intermediate tubercles cannot be determined from the 

 material at hand. The postero-external tubercle is of well propor- 

 tioned size. The tooth is broken on what I take to be its antero- 

 external angle. 



The lower dentition of the type. No. 2928, is much better preserved 

 and furnishes more satisfactory means of comparison. There were 

 most likely three lower incisors, though this cannot be fully deter- 

 mined from the type. Judging from the roots, the second incisor was 

 of rather small size, while I3- was quite large. The canine, premolars 

 Y, 2". the anterior portion of P4 and M3- unfortunately were not re- 

 covered. The root of the canine presents a long oval, placed nearly 

 in a direct antero-posterior position on the axis of the jaw. The 



11 Amer. Journ. Set., (4), Vol. XI, 1901, p. 341, Vulpavus; pp. 342-445, Lycarion 

 hargeri (Wortman). 



12 Mem. Amer. Mus. Nat. Hist., Vol. IX, 1909, p. 343, Lycarion; pp. 344, 346, 380, 

 Vulpavus palustris Marsh. 



