GENUS AND TEN NEW SPECIES OF JAPANESE FISHES. 9 



before upper lobe and ends posteriorly some distance behind end 

 of the latter, continued behind into a long slender caudal fila- 

 ment about 4-3- times as long as a diameter of eye ; upper lobe 

 even, very smooth in margin, its height as measured along rays 

 contained 2^ times in diameter of eye. Lower lobe smooth at 

 edge, slightly longer than diameter of eye when measured as above. 



Body naked ; sensory canal system well developed ; lateral 

 canal begins with a curve with the convexity facing backward, 

 runs much nearer back than belly, is almost straight and con- 

 current with back ; it bends abruptly downward at a jioint 

 slightly farther than eye diameter beyond origin of upper cau- 

 dal lobe and then proceeds along low^r side of body into caudal 

 filament. Nuchal canal originates from supraorbital canal behind 

 eye, curves backward with convexity facing forward, and passes 

 slightly backward across nape to join its fellow of the other side. 

 On head jugular branch given off from the suborbital at a short 

 distance behind the maxillo-mandibular. 



Cephalic organ directed forward and downward, situated on 

 snout above anterior margin of eye; distance from its tip to root 

 of its axis | the diameter of eye ; numerous, recurved, spinous 

 denticles on the under surface of its distal two-thirds. Claspers 

 rather slender, unbranched, extending to near posterior margin 

 of ventral, its distal end enlarged, with about three oblique 

 rows of small slender spinules. Anterior ventral clasping organ 

 armed with 3 spinous denticles on the inner side. 



Colour in formalin brownish ; darker on lower and under 

 surface of head. All the fins of the same colour as body, nar- 

 rowly edged with blackish. Above the lateral canal there are 

 about 30 transverse broken lines, of which the posterior ones 

 are scarcely visible. 



