14 Bulletifi American Museicm of Natural History. [Vol. XIV, 



This genus, while close to Arctocyon, is distinctly less specialized, 

 and the differences seem to warrant generic separation. Ana- 

 codo7i, of the Wasatch, is much more specialized than any of the 

 Basal Eocene species. All the genera, as far as known, have 

 long, sharp, serrate canines, somewhat flattened and very little 

 worn, premolars in various stages of disuse and reduction, molars 

 becoming flat-topped and quadrate. The little-used premolars 

 and canines may be contrasted with, those of the Mesonychidae 

 and Oxysenidse, in which they were well worn, often to enamelless 

 stumps. The canines may have been chiefly for defense against 

 enemies, the animal not being to any extent carnivorous. 



The fore and hind feet here figured are of much interest, 

 showing for so early a period an unusual degree of specialization 

 in certain characters. 



The Fore Foot. 



The carpus is distinguished especially by the large rectangular 

 cefitrale, lying half under the lunar, half under the scaphoid and 



fiised to the latter bone. 

 The lunar-centrale fa- 

 cet still persists but the 

 lunar - scaphoid facet 

 has disappeared, re- 

 placed by a roughened 

 bony surface ; this pro- 

 bably points to an ap- 

 proaching union of 

 scaphoid and lunar. 

 The lunar is keeled, 

 and faceted for cen- 

 trale and magnum on 

 one side, for unciform 

 on the other. The tnag- 

 num has a broad cen- 



rig. 6. Clcenodon corrugatiis(Q,oT^i.\. P'ore foot, natural 

 size. Specimen No. 2456. Torrejon Beds, Wyoming. trale faCCt and UarrOW 



lunar facet separated 

 by a sharp keel. This arrangement would, upon union of the 

 scapho-centrale and lunar give a proximal keeled facet on the 

 magnum fitting into a correspondingly grooved facet on the 



