Stewart. I Cretaceous Fishes. 375 



at each extremity, one of which is much longer than the other. 

 Along one of the borders there is a deep groove which is bounded 

 on each side by a thin lamina of bone. The third, fig. 10, is a 

 thickened mass of bone of an irregular shape, with a roughened 

 articular surface at one end, which extends beyond the remainder 

 of the bone in a spine-like projection. The fourth and last of 

 these bones, rig. 10, is very peculiar, in that it is almost iden- 

 tical with that described and figured by myself as an opercular 1 ' 52 

 bone of Xiphactinus. I would be inclined to think that I was 

 mistaken in referring this to Xiphactinus were it not for the fact 

 that Professor Cope has figured this in his " Cretaceous Verte- 

 brata" IS3 as an " uncertain bone " of this genus. This bone is 

 similar in structure, color, and in the matrix surrounding it, to 

 those described above ; so there is little probability of it having 

 become mixed in collecting. The known American species are : 



Enchodus ferox Morton, Leidy, below Greensand No. 5, New Jersey. 

 Enchodus pressidens Cope, Greensand, New Jersey. 

 Enchodus petrosus Cope, Niobrara Cretaceous, western Kansas. 

 Enchodus dolichus Cope, Niobrara Cretaceous, western Kansas. 

 Enchodus calliodon Cope, Niobrara Cretaceous, western Kansas. 

 Enchodus oxytomus Cope, Cretaceous, New Jersey. 



hod us tetracus Cope, Cretaceous, Delaware and New Jersey. 

 Enchodus shumardi Leidy, Cretaceous, Dakota. 

 Enchodus i Phasganodus) dints Leidy, Cretaceous, Dakota. 

 Enchodus [Phasganodus) gladiolus Cope, Niob. Cret., western Kansas. 

 Enchodus [Phasganodus) anccps Cope, Niob. Cret., western Kansas. 

 Enchodus {Phasganodus) carinatus Cope, Niob. Cret., western Kansas. 

 Enchodus [Phasganodus] 8t mistriatus Marsh, Cretaceous, New Jersey. 

 Enchodus amicrodus Stewart, Niobrara Cretaceous, western Kansas. 

 Enchodus minimus Stewart, Niobrara Cretaceous, western Kansas. 



Enchodus shumardi. 



Enchodus shumardi Leidy, Proc. Acad. Nat. Sci. Phil., 1856, p. 257; 

 Rep. U. S. Geol. Surv. Terr., i, 1873, p. 289; Cret. Vert. West, p. 238. 



Represented by the dentary bones of several individuals col- 

 lected by Professor Mudge from the Niobrara Cretaceous of 

 Kansas, the exact locality of which is not known. 



The dentaries are small and slender and are about 35 mm. in 

 length. The internal alveolar border supports six large teeth, 



Kan*. Univ. Quart., vol. VIII A. 

 133. I.e., pi. XI. 



