Stewart.] Cretaceous Fishes. 377 



unknown genus, which was later shown by Professor Cope to 

 be a synonym of Enchodus. 1 ** The specimen here represented 

 consists of a fragmentary mandible, No. 322, and was obtained 

 by Mr. E. P. West from the Niobrara Cretaceous deposits of 

 western Kansas, the exact locality of which is not known. 



Only the internal side of the dentary is exposed, which shows 

 four large teeth on the alveolar border, which are probably fol- 

 lowed by one or two more. The most anterior of these is set 

 upon an expanded base and has a sharp cutting edge antero- 

 externallv, while postero-internally it is rounded and covered 

 with well-marked striae. The cross-section is thus seen to be 

 pyriform. At the base of the tooth, anteriorly, there is a slight 

 pit, in front of which there are two small teeth near the sym- 

 physis. The second of the large teeth is the smallest preserved. 

 It is non-striate and has anterior and posterior cutting edges 

 directed slightly outward and inward. The third and fourth 

 are slightly striated near the base and have the anterior cutting 

 edges directed outward more than in the second. The sym- 

 physeal portion is not well preserved, but the bone probably 

 becomes very shallow at this point. A well-marked fossa for 

 the articular extends forward to a point about half way between 

 the second and third large teeth. 



Length of first large tooth ( estimated ) 32 mm. 



Distance from symphysis 12 " 



Lenth of second large tooth 14 " 



Distance from symphysis 47 " 



Length of third large tooth 21 " 



Distance from symphysis 77 " 



Length of fourth large tooth ( estimated ) 20 " 



Distance from symphysis 101 " 



Enchodus dolichus. Plate LXX, fig. 12. 



Enchodus dolichus Cope, Cret. Vert. West, pp. 239, 240. 



This species is represented by portions of several individuals, 

 consisting of the palatines, ectopterygoids, and fragments of 

 other tooth-bearing elements. 



The palatine is much smaller than in E. petrosus, and presents 

 the long, fang-like tooth at the anterior extremity, which is non- 



Uft. Cret. Vert. West, p. 301. 

 25 — vi 



