144 Bulletin American Museum of Natural History. [Vol. XII, 



has an oval form ; the coracoid is prominent, and the relatively 

 strong spine arises a short distance behind the glenoid border. 

 There is evidence of a well developed acromion and metacromion, 

 about as in Patriofelis. The humerus, like that of many of the 

 Creodonts, has a powerful deltoid crest which occupies somewhat 

 more than one half the entire length of the shaft. The head is 

 pyriform, the tuberosities well developed, and the bicipital groove 

 is deep. Distally the bone is broad, as in many of the modern 

 Carnivores, especially the felines. There is a very prominent 

 internal condyle ; an entepicondylar foramen, and a somewhat 

 reduced supinator ridge. The articular surface is very much as 

 in the Cats. The ulna has a very prominent incurved olecranon, 

 the shaft is straight, and the two distal articular facets are well 

 separated as in the Cats. The head of the radius presents an 

 oval outline with an unusually prominent tubercle. The lower 

 end of the shaft is triangular in cross-section, and the scapho- 

 lunar facet is concave. The fore foot has already been fully 

 described,' and there is little of importance to add. The foot is 

 relatively broad and spreading as in Patriofelis; the scaphoid, 

 lunar, and centrale are free ; the first phalanx of the thumb is 

 relatively large, and all the claws are deeply fissured with the 

 possible exception of the fifth. There is reason to believe that 

 the habitual position of the foot was digitigrade, but there is no 

 evidence of any retractility of the claws. 



Hind Litnb. — The pelvis is not very well preserved but enough 

 is present to indicate that it was very similar to that of Patrio- 

 felis. The femur has a well-rounded head, a nearly straight 

 shaft, and a small though distinct third trochanter. The tibia 

 equals the humerus in length and has a slightly curved shaft ; 

 the cnemial crest is prominent, the internal malleolus is unusually 

 thick and heavy, and the distal trochlea is directed obliquely 

 inwards and is little excavated. The fibula is complete and 

 comparatively little reduced. The hind fo;)t is more slender 

 than the fore foot. The tibial facet of the astragalus is but 

 slightly grooved ; the astragalar foramen is distinct, and the head 

 of the bone is flattened from before backward, rounded and 

 oblique ; it articulates with both cuboid and navicular. The 



^ ' Fossil Mammals of the Wasatch and Wind River Beds.' Bull. Amer. Mus. Nat. Hist., 

 Vol. IV, 1892, p. 108. 



