162 ART. II. A. IZÜKA : 



tough, but is very flexible and translucent ; pale white in 

 colour. The worms are gregarious. Large masses of tangled 

 branches of a floating sargassum, held together by the strongly 

 adhesive secretion of the colony of N. Agasslzi, are often found 

 in Misaki. 



Habitat :—Misaki in Prov. Sagami (!), March 29th, 1908. 



JV^ereis kobiensis Mcintosh. 



PL XVII, figs. 12—13. 



1885. Nereis (Platjnereis) kobiensis, Mcintosh. " Challenger " Anuel., 

 p. 210, PI. XXXIV, figs. 3—6 ; PI. XVI-A, figs. 2—4. 



Body slender, measuring 40 — 60 mm. in length, and 3.5 — 4.5 

 mm. in breadth, including setae, at about 20th segment. 



Prostomium somewhat longer than broad ; tentacles about the 

 length of prostomium. Palpi large, tip of the bosses scarcely 

 reaching that of tentacles. Eyes large, each furnished with a 

 lens. Tentacular cirri attenuate, the longest reaching to 14th or 

 15th segment. First segment longer than the second, and with 

 a peak in front directed forward. 



The body presents no colouration dorsally, the only pigment 

 present being that in the grandular masses at base of 

 parapodia. 



Parapodium (the 10th) with three prominent rounded ligulae, 

 the superior being ventrally more oblique in outline than dor- 

 sally. "Dorsal cirrus slightly longer than % the height of 

 parapodium, stretching considerably beyond superior ligula ; 

 ventral ramus not reaching tip of inferior ligula. Dorsal 

 bristle-tuft composed of a series of ordinary bristles with short 

 and ])oldly serrated setose end-i3iece, and of a single deep 



