281 



B. Origin of dorsal (if present) above or behind 

 gillopenings. 

 a. Caniniform teeth on vomer and mandibles in 



a single series. There may be a fringe of 



barbels on upper lip Brachysomophis p. 313. 



Teeth conical or granular, not caniniform, in 



jaws in bands or series, on vomer generally 



present. 



a. A conspicuous fringe of barbels on upper lip. Cirrhimuracna p. 290. 



b. Lips without barbels. 



1. No teeth on vomer Leiuranus p. 293. 



2. Teeth on vomer present. 

 a'. Pectorals well developed. 



a. Teeth granular, in bands Pisoodonophis p. 295. 



/3. Teeth conical, acute, subequal . . Ophichthys p. 300. 

 b'. Pectorals wanting Sphagebranchus p. 317. 



i. Hemerorhinus n.g. 



Much elongate, cylindrical. Anus behind middle of length. 

 Origin of dorsal somewhat behind that of anal. Dorsal and 

 anal not confluent, ending at a short distance from end of tail. 

 Pectorals wanting. Head short, snout pointed, projecting beyond 

 mouth, the cleft of which reaches far behind eye. Lips without 



Fig. 128. Hemerorhinus heyningl (M. Web.), a lateral, b ventral view; 

 v anterior, h posterior nostril, k gillopenings, in fig. b connected by a furrow. 



filaments. Eye small, situated in anterior fourth of head. 

 Anterior nostrils a short tube directed backward at the edge 

 of the upper lip below frontborder of eye ; posterior nostrils a 

 long slit, below and behind eye, at some distance above the 



