Stewart. I Cretaceous Fishes. 379* 



Enchodus amicrodus. 



Enohodus amicrodus Stewart, Kans. Univ. Quart., vol. vn a, p. 193. 



This species is represented by the type specimen only, which 

 consists of the right dentary, the external side of which is ex- 

 posed. The catalogue number of the specimen is 324. 



The principal character that distinguishes this species from 

 the others belonging to this genus is found in the absence of a 

 row of minute teeth on the external alveolar border. The 

 dentary is shallow and supports nine or ten large teeth. The 

 anterior of these teeth is slightly recurved at the apex, and the 

 base does not seem to be expanded as in some of the other 

 species. The external surface of this tooth seems to be non- 

 striated. The following teeth are mostly broken away but their 

 bases show them to have been irregular in size. 



& 



Length of alveolar border 63 mm. 



Height of anterior tooth above border. 10 " 



Distance from symphysis 5 " 



Depth at symphysis 6 " 



Enchodus, sp. Plate LXX, fig. 13. 



This species is represented by the remains of the mandibles 

 of several specimens, which may belong to E. dolichus. As 

 Professor Cope did not characterize this portion in a way to 

 render it recognizable, it will have to remain in doubt until the 

 specimen mentioned by Cope is more fully described. 



The dentary is rather elongated, and thin inferiorly. The 

 alveolar border is slightly thickened, and bears teeth, of 

 which those on the external side are very small, while those 

 on the internal side are larger, less numerous. There are 

 nine or ten of these large teeth, the anterior of which is the 

 largest and slightly striated. The remaining eight or nine are 

 non-striated, and extend farther back than do those on the ex- 

 ternal row. The posterior extremity of the dentary is toothless 

 and directed slightly upward, forming a slight coronoid process. 

 The depth of the bone decreases rapidly toward the symphysis, 

 where there are numerous bony tubercles for attaching the two 

 jaws together. The external surface is smooth, with the excep- 



