50 ART. 7. S. TANAKA ! 



Head 151 to 17 y- in total length to caudal base ; height of 

 body 38 to 474 ; snout 31 to 41 in head ; eye 32 to 4 ; inter- 

 orbital 41 to 6f. 



Body anguilliform, very elongate, slender, compressed ; head 

 and anterior parts of body of almost equal height, very gradually 

 tapering posteriorly ; head quadrate when viewed from side. Eye 

 before middle of head length, lateral, high up, the upper margin 

 slightly elevated, rather large in size ; interorbital and nape almost 

 flat ; behind nape the upper surface of body is somewhat rounded, 

 and distinctly so in the more posterior parts. Snout short ; upper 

 profile horizontal before eye, in front steeply curved down. Mouth 

 large, horizontal, subinferior ; corner of mouth beneath anterior 

 rim of eye ; jaws about equal ; teeth comparatively large, incisor- 

 like, set rather closely in a row ; in upper jaw a fang-like back- 

 wardly curved tooth at some distance behind the row of teeth ; a 

 much larger but similar fang-like tooth directly behind the row 

 of teeth on lower jaw, fitting to a groove in the roof of mouth 

 situated on the inner side of the fang of upper jaw. Gill-slit 

 subvertical, slightly shorter than vertical length of base of pectoral, 

 and situated near pectoral, with the two-thirds of its length 

 extending above pectoral. Ventrals very closely set, contiguous, 

 originating from throat just behind gill slit, moderate in size, its 

 tip below that of pectoral ; pectoral moderate in size, its middle 

 rays longest ; dorsal originating from anterior margin of orbit ; 

 vent directly before anal ; anal originating between 14*'' and 15^^ 

 rays of dorsal ; both vertical fins moderately high, the membrane 

 between rays of these fins rather thin, confluent with caudal but 

 distinct from the latter ; last rays of both vertical fins at almost 

 same vertical ; middle two rays of caudal filiformly prolonged. 



Body smooth, scaleless, with three lateral lines ; the first 



