EERANTIATE POLYCHAETA OF JAPAN. 185 



Ventral cirri lanceolate (pinniform). Proboscis (in extrusion) 

 with an anterior row of twelve fiat papillae, and behind these 

 a series of horny teeth. A single dorsal tooth. Parapodium 

 truncate, bilobed ; bristles with rather large, boldly bifid terminal- 

 piece. 



Trifpaiiosyllis inisakiensis Izuka. 



PL XX, figs. 2— G. 



1906. Tiypanosyllis inisakiensis, Izuka. Aimot. Zool. Jap., Vol. V, 

 p. 283. 



Body elongate, depressed ; dorsum slightly convex ; ventral 

 surface plain, longitudinally bisected b}^ a median welt bounded 

 by two fine parallel grooves. The body narrows posteriorly 

 more than anteriorly. Length of body 21.0 mm. ; maximum 

 breadth including parapodia 2.2 mm. at about the posterior end 

 of the anterior third of body ; thickness 0.7 nun. in the same 

 position. 



Segments short and numerous (in all about 260 in number). 



Prostomium broader in front tliau Ix'hind, bilobed. Ocular 

 region on each side elevated into a prominent subelliptical lobe, 

 which extends a considerable distance behind posterior eye. 

 Eyes in two i)airs ; anterior eye about twice the posterior in di- 

 ameter, directed sliglitly forwards and upwards, with an indication 

 of a lens. Posterior eyes a short distance behind the anterior. 

 Median tentacle arises from about the level of the anterior pair 

 of eyes, wliile paired tentacles originate from the anterior end 

 of prostomial lobes. All the three tentacles are nearly equal 

 in length, ;iud nrc anuulated similarly as peristomial and dorsal 



