48 Annals of the Carnegie Museum. 



The astragalus is represented by the head, which is broad as in L. 



verus. 



Measurements. 



Length of upper molar-premolar series 54 mm. 



Length of mandible, condyle to point of symphysis 131 " 



Depth of mandible at Pj 25 " 



Depth of mandible at M 2 20 " 



Length of lower molar-preraolar series 55 " 



Length of lower premolars 32 " 



Length of lower molars i and 2 23 " 



Length of femur 122 " 



Family MIACID^ Cope. 

 Genus Mimocyon gen. nov. 



4. Mimocyon longipes sp. nov. (Plate XXXIV, Figs. 6-10.) 



Type: Fragments of the left lower jaw with Pj and My in place, 

 fragment of Pj? and greater portion of the lower canine of same side; 

 the distal end of the humerus, proximal end of the ulna, a section of 

 the shaft of the radius, the distal articulation of the tibia, the tarsus, 

 and proximal ends of three metatarsals, C. M. No. 3022. 



Horizon: Uinta Eocene, Horizon C, near base. 



Locality: Six miles east of Myton, Uinta County, Utah. 



Generic Characters: Antero-posterior diameter of P^ and ify ^Qual. 

 Anterior and posterior accessory cusps small and heel large. Trigonid 

 low and small, heel large and basin-shaped. Tarsus high. 



Description of the Type. 



The ramus is not deep and is rather thin transversely. Py had in 

 all probability two roots. The succeeding alveoli of P^- and P-g- indi- 

 cate that they were of considerable antero-posterior diameter and 

 were distinctly two-rooted. Py is not reduced in size, its antero- 

 posterior diameter equals that of My. The principal cusp of the 

 crown is not compressed laterally, is rather high, and has distinct 

 ridges in front and behind. There is a small anterior basal cusp, which 

 more appropriately might be regarded as a heavy cingulum, a promi- 

 nent basal heel, and a small accessory tubercle posteriorly. The 

 cingulum is well developed and completely surrounds the tooth, in 

 this respect answering the description of Miacis vulpinus (Scott). ^ 

 My has an unusually small and low trigonid, which is very little greater 



^ Proc. Atner. Assoc. Adv. Sci., 36th meeting, New York, 1887, p. 255. 



