210 PROCEEDINGS OF THE ACADEMY OF [NoV., 



ff. Body cylindrical, fusiform, scales firm, more or less 



crenulate, about 25 in a cross series; no lateral line, 



opercle very large, convex, much larger than sub- 



opercle. Rhacolepis. 



ee. Ventrals inserted under first ray of dorsal; lateral line 



well developed; body elongate; teeth small, even. 



Elops. 



bb. Dentition uneven, but weak; mouth moderate, oblique; 



scales large; caudal fin with about 10 broad, much-branched 



rays. Ancedopogon. 



bbb. Dentition uneven, some of the teeth large, canines robust. 



g. Maxillary extending far beyond eye; front of jaws with 



very broad teeth; posterior teeth in lower jaw small and 



even. Enneles. 



gg. Maxillary scarcely extending beyond eye; front and 



middle of lower jaw with very long fangs; no broad teeth. 



Enneh'chthys. 

 aa. Megalopin^: Pseudobranchiae none; scales large, firm; 

 anal fin larger than dorsal; last ray of dorsal produced into 

 a long filament; postorbital bones very thin, membrana- 

 ceous; teeth uniform; body compressed, 

 h. Dorsal fin inserted above ventrals. Megalops. 



hh. Dorsal fin inserted behind ventrals. Tarpon. 



Fiimily ASPIDORHYNCHID^. 

 VINCTIFER new genus. 



The Brazilian Cretaceous species hitherto referred to Belonosto- 

 mus differs from the type of the genus in the very much greater depth 

 of the scales composing the lateral line. These are anteriorly 

 about five times as deep as long. The jaws are also more robust than 

 in the typical species. 



In the type of the genus Belonostomus {B. tenuirostns) the jaws 

 are excessively elongated and the scales of the lateral line are scarcely 

 larger than the others. I propose to separate Belonostomus comptoni, 

 and the European species allied to it, as a distinct genus which may 

 be called Vinctifer. It is characterized by the very deep band-like 

 scales along the sides, the relatively. short jaws, and the relatively 

 robust body. 



