52 AET. II. — A. IZUKA : 



body as well as the prostomium, leaving only a few pos- 

 terior segments uncovered. The lateral and posterior half of 

 elytra is beset with pear-shaped papillae of a dark colour. These 

 papillae are distinctly observable with the naked eye ; with the 

 aid of the microscope one sees in addition numerous small conical 

 papillae arranged in rows that run antero- posteriorly but diverge 

 somewhat as they approach the posterior margin of elytron. The 

 lateral and posterior margins of all elytra are provided with 

 somewhat long and filiform papillae. 



The dorsal ramus of parapodia bears a large bundle of strong 

 bristles (fig. 10) of a brownish dark colour. The bristles of the 

 ventral ramus are about 40 in number ; they are all of a pale 

 yellow colour. They are smallest in ventralmost position (fig. 

 11, a) and increase gradually in size dorsally (b) ; those in the 

 upper part of the group arc of a form with bifurcated tip (c), 

 while a few in dorsalmost position are of a form with finely 

 tapering end (d). 



The first ventral cirrus is about equal in length to the me- 

 dian tentacle, while those of other parapodia are conical with 

 finely tapering end and do not reach the tip of the ventral para- 

 podial ramus they belong to. 



Xephridial papillae are observed from the 6tli or the 7 th 

 segment posteriorly. 



Anal cirri long, being about equal in length to that of the 

 posterior 11 segments taken together. 



The breeding season of this species in Misaki extends from 

 August to September. 



Habitat :— Off" Nagai, north of Misaki (!) ; Yenoshima ; 

 Misaki (!) 



