

J 885.] u I Cope. 



Diameters of root of antepenult tooth 

 Diana, of root of penultimate of row 



Measurements. M. 



transverse 015 



anteroposterior .010 



transverse 007 



anteroposterior . . .010 

 From Maria Farinha, Province of Pernambuco. Probably of Fox Hills 

 or Maestrichtian Cretaceous age. Coll., No. 306. 



Enchodus sub^equilateralis, sp. nov. 



This species is represented by a prernaxillary bone bearing the long 

 laniary tooth characteristic of the genus, and by another osseous fragment 

 bearing a similar tooth, which may perhaps belong to the distal part of the 

 dentary bone. I describe the first-named specimen. The fragment of the 

 prernaxillary is so small that little can be said of it, except that its surface 

 is smooth, and but slightly convex, and that it projects but little beyond 

 the long tooth. The tooth is long and slender, and has a very slight sig- 

 moid fore and aft curvature. It has two opposite cutting edges, the ante • 

 rior of which reaches to its base, and the posterior for half of its length. 

 The inner face of the tooth begins to be more convex than the external 

 at about the middle of its length, but this convexity is not much marked 

 beyond the basal fourth. The surface of the tooth is smooth everywhere. 



This species is readily distinguished from such species as E. mortoni, 

 where the edges are not opposite. From the E. carinatus and E. gladiolus, 

 where the edges are opposite, the smooth surface separates it. In the allied 

 E. doliclius* the posterior cutting edge only extends one-quarter the length 

 of the tooth. 



Length of crown M. .022 ; diameters at middle, long, .004 ; short, .0023. 



DlPLOMYSTUS LONGICOSTATCS, Sp. nOV. 



This herring is represented by numerous specimens, and possesses well- 

 marked characters. These may be stated in general thus: The caudal 

 part of the vertebral column is very short. The abdomen is very deep 

 and the ribs are long. The caudal fin is deeply forked, and has long acute 

 lobes. The other fins are very small. 



The scales are so attenuated as not to be countable. The scutes of the 

 median dorsal line are longer than wide, and are emarginate behind, and 

 hence cordate. The superior surface of two of them is roughened with 

 radiating ridges. The inferior surfaces are smooth. None behind the 

 dorsal fin. 



The dorsal outline rises gradually to the dorsal fin, and then gradually 

 descends to the caudal peduncle. The general convexity is slight. On 

 the other hand the abdominal convexity is very great, and is especially 

 protuberant below the dorsal fin. The depth at this point enters the total 

 length, minus the caudal fin, one and five-sixth times. The length of 

 the head enters the same three times. The superior surface of the head 



*See Report on Cretacequs Vertebrata of the West, E. D. Cope, p. 300. 



