Peterson: Material Discovered in Uinta Basin. 49 



in the antero-postcrior diameter than the heel. The anterior and 

 internal tubercles of the trigonid are of moderate development, while 

 the external is, as usual, the largest of the three. The heel is unusually 

 large and decidedly basin-shaped. Externally this tooth has a well- 

 developed cingulum, but internally it is smooth. M-j was of consid- 

 erable size, judging from the alveolus. M-g- was evidently present, 

 but whether or not it had two roots cannot be determined from the type 

 specimen. 



The distal end of the humerus is comparatively broad, and in this 

 respect it suggests such forms as Miacis parvivorus and Oodectes 

 proximus, described by Matthew.^ The entepicondyle and the entepi- 

 condylar foramen are also of large size and the trochlear portion for 

 the radius convex, as in M. parvivorus. The trochlea for the greater 

 sigmoid cavity of the ulna is wide and the supinator ridge does not 

 extend high up on the shaft. 



A fragment of the proximal end of the ulna is preserved with the 

 type. Tie olecranon process appears to have a moderate expansion 

 antero-posteriorly and the anterior border is compressed laterally 

 immediately above the greater sigmoid cavity. The latter is quite 

 wide and oblique, with a prominent coronoid process and a concave 

 lesser sigmoid cavity, which indicates power to rotate the head of the 

 radius. The shaft appears to have a considerably backward curve, 

 and is compressed laterally, expanded antero-posteriorly, and deeply 

 channeled on the ulnar face. 



The distal trochlea of the tibia is not broad, and there is a shallow 

 groove separating the internal malleolar facet from the external 

 portion of the trochlea. The astragalus is high and narrow, with a 

 long neck unlike that of Miacis parvivorus and more suggestive of the 

 astragalus of Cercoleptes. 



The trochlear groove of the astragalus is shallow, the internal ridge 

 being low, but more developed than in the form from the Bridger and 

 in older genera. The head is laterally broad and there is present a 

 minute astragalar foramen. The tuber of the calcaneum is compressed 

 laterally and terminates above in a prominent tuberosity, which is 

 very slightly grooved. The lesser process is not greatly expanded 

 and the facet for the cuboid is very oblique. The dorsal face of the 

 calcaneum is broken ofT. The navicular is proportionall}' narrow, 



^ "Carnivora and Insectivora of the Bridger Basis," Mem Amer. Mus. Nat. Hist., 

 Vol. IX, 1909, pp. 368, 378. 

 4 — DEC. 2, 1919. 



