EERANTIATE TOLYCHAETA OP JAPAN. 63 



slightly hooked undivided end ; in the region of the thickening 

 occurs a half -ring of long, fine, comb-like teeth supported on a 

 slight shoulder (fig, 19). Ventralmost bristle with shorter, stouter 

 and more strongly liooked tip (fig. 18). 



Elytrophores prominent, nearly cylindrical ; the median space 

 of back scarcely exceeding their diameter in width. 



Elyti-a occurs on segments 2, 4, 5, and then on alternate 

 segments down to 21, then on 22, 24, 27, 30, 31 and again on 

 alternating segments down to the posterior end. The first is nearly 

 circular, the last somewhat triangular, all the others broadly ovate 

 with a slightly excentric postero-lateral attachment. All elytra 

 thin, smooth, colourless and translacent ; without cilia or papillœ. 



Habitat :— Sagami Bay, 31 fatlioms (-'Albatross"); Off" 

 Yonoura in Prov. Suruga, about 90 fathoms (Mr. K. Aoki). 



Genus Tphione Kinberg. 



Prostomium very distinct, with 2 tentacles and 4 eyes. 

 Peristomium indistinct, with 2 pairs of tentacular cirri. Para- 

 podium apparently uniramous, bearing superiorly a thick tuft of 

 liairs and inferiorly unjointed strong setae. Elytra alternate witli 

 dorsal cirri. Proboscis witli 2 ])airs of jaws. 



IjyJiione hi rota i n. sp. 



PI. A'lT. figs. S— 15. 



Body consisting of 29 segments, sliort and broad; lengtli 

 14 min. ; iM-cjidth in about the middle of liody 9 mm. including 

 parapodia and seta;, and ."> mm. excluding same: thickness in i\\e 

 same region alioiit 3 mm. 



