CREODONTA.. 327 



clcenus are best seen in the subconical tubercles of the premolars, particu- 

 lai'ly that of the heel of the fourth inferior premolar. In the other species 

 this heel is more of a crest and is connected with the principal cusp by a 

 low ridge. 



All the specimens of the Mioclcenus turgidus are from the Puerco beds 

 of New Mexico, where they were found by Mr. D. Baldwin. 



MiOCLiENUS MINIMUS Cope. 



Paleontological Bulletin No. 35, 1882, ^. 468. 

 Plate XXV e; figs. 22-24. 



This is one of the least mammalia of the Puerco fauna, exceeding by a 

 little the Hyopsodm acolytus. It is represented by parts of two mandibles, 

 which display all the true molars. The premolars are strictly those of 

 Mioclcenus. 



The two anterior cusps of the true molars are higher tlian the heel, 

 and they are united together to a point above the level of the heel. The 

 section of both those of the !JI. ii is round; that of the external one of the 

 first is crescentic; of the inner cusp, round. The heel is wide, and sup- 

 ports a cusp at the posterior external angle. It is bounded posteriorly and 

 on the inner side by a raised ridge, which gives with the cusp, on wearing, 

 a comma-shaped surface. A transverse ridge closely appressed to the ante- 

 rior cusps connects them anteiiorly. In one of the specimens there is a 

 cingulum on the external side of the second inferior molar; on the other 

 specimen it is wanting. Enamel smootli. 



The mandibular ramus is rather deep and compressed, and displays 

 an external ridge on the anterior border of the coronoid, which is not con- 

 tinued downwards. 



Meas u rem ents { l\''o, 2 ) . 



ir. 

 Length of base of trne molais 0125 



Diameter M.ii^''"t<^'^°P°«*«™^ ^'"-"^ 



( transverse 0035 



Depth of ram us at M. ii 0073 



From the Puerco beds of New Mexico. D. Baldwin. 



