EEKANTIATE POLYCHAETA OF JAPAN. 225 



cirrus pale white, lying below and rather behind the ventral tnft 

 of bristles. 



About 26 pairs of branchiœ are arranged along the dor- 

 sum ; each pair situated at the posterior border of segment, a 

 short distance from dorsal cirrus. Their structure is somewhat 

 dendritic, spreading nearly in one plane ; the main stem first 

 gives off a large external branch ; this generally divides into 

 two and then into branchlets wdiich bear ultimate pinnules. 

 Other branches of tlie main stem are transversely directed and 

 become subdivided into pinnules. The branchiae continue to 

 occur posteriorly to the penultimate segment, continually di- 

 minishing in size. 



The dorsum of the worm has a very conspicuous median 

 row of deep brownish-purple spots, each of which occupies about 

 tlie posterior j| oî each segment. Tlie spot is encircled by a 

 yellowish -white band. A transverse brown band also occurs in 

 the anterior part of each segment, running outwards from base 

 of branchia). Tw(^ elongated anal cirri are situated behind and 

 below anus. 



The food of this auin^al consists of small crabs and other 

 living organisms. The breeding season extends from July to 

 August in Misaki. 



Habitat : — Tliis species occurs all along tho Pacific coast of 

 .lapan, from t1ic Hay of Saga mi as far south at least as the Gulf 

 of KagosliiiiKi. On flic ,l;ipau Sea side, it extends from Tsushima 

 Island to the coast of Nanao in the Province of Noto. Two 

 cxampli^s of this species were trawled In- " Challenger " at her 

 Stat. 2:>3ii (" Soutli of Japan") from a dcptli of 15 fatlioms. 

 Tatyama (Tatcy;iina '.'), S fatlioms (" Albati'oss "). 



