ERRANTIATE POLYCHAETA OF JAPAN. 81 



postoi'iorlr wit]i a pit on each side of tlie nuchal ridge. Median 

 tentacle Ioult, being about 4 times as long as the prostomium, 

 and ', of which constitutes the coi'atophore. Subtentacles about 

 3 times as long as tlie median tentacle. Ocular peduncles large 

 and globular, and though no distinct eyes are visible, a slight 

 ring is present on tlie anterior convexity of the peduncle. 



Dorsal spines of a dull In-ownish hue with metallic iridescence ; 

 tlie flattened shaft has very distinct prickles ' thinly scattered 

 over it, while the tip gently tapers to a point, which has usually 

 2 or ?) recurved fangs on each side (fig. 14), but sometimes o on 

 one side and 2 on the other. 



A^entral setae (fig. 15) quite uniform throughout, each consisting 

 of an angular and bristle-like shaft and of a terminal portion w^itli 

 somewhat long pinnae which distally decrease in length ; no spur 

 present. 



A'entral surface of body smooth to the naked eye, but 

 when examined micrc^scopically, shows a few somewhat clavate 

 ]M\]V\\\n.o. 



'Hie dorsal felt is somewhat frial)le and soft, the elongated 

 hairs with hooh'od ends being envelojH'd in a gelatinous material 

 loaded with sand-grains, diab^ms, fi-agments of shells. Sec. 



IVoJxiscis long, reaching, wlieii fully ])rotru(led, to a length 

 ahoul e(|iial to that of the 1- aiiterioi'most setiger(^us segments 

 taken together. 



llMl.Kal : SoiiMi of Japai!. r,i:. fallKMns (" rhallenger "') ; 

 Sagaini I'.ay, \2 l'atlmms (( lolden-l I iiid expedition by I'i'of. I. 

 Ijima) ; West ni' Misaki, abont 2'.) fafhonis ; Awa/aki-line i^' ord 

 Mcra nut in S;i;jaini lîay. iM fallionis; oil' Viigahana in Prov. 

 U/eii, 7S fathonis ; Saganii May, 1.":) fathoms (•'Albatross"). 



/i'r//?a/7.'s : -- Iji the li\ing specimen jU'ocured (M\ April 5th, 



