EERANïIATE TOLYCHAETA OP JAPAN. 153 



in. crowded in two transverse rows ; V. 3 small ones in a triangle ; 

 VI. a large transversely elongate one in each ; VII., VIII. in two 

 parallel continuous rows. Maxillae large but slender, with 5 teeth 

 below terminal fang. 



Epitocous plias3 : — In the female the first 18-23 segments, 

 and in the male the first 14 — -20 segments, are unchanged. Anal 

 segment fringed with short papillae. Male whitish, female greenish 

 yellow. 



I observed a large swarm on the night of Sept. 1st, 1896, 

 in the Misaki harbour. 



Habitat : — Misaki (!) ; Shimizu Harbour in Prov. Suruga (!) ; 

 Toba in Prov. Shima (!) ; Benin Islands (Mr. S. Hirota) ; Formosa 

 (Mr. M. Öshoia). 



Nereis cylinclrata Ehlers. 



PI. XVI, Fig. 15. 



1868. Nereis cyliudrata, Elders. Die Borsteuwürmer, p. 506, Taf. 

 XXT, Fig. 37—10. 



Body slender, imiformly broad ; segments 60. Length 58 mm. ; 

 breadth 4 mm. without, and 5.5 mm. witli, parapodia and bristles. 



Prostomium scarcely longer than broad ; tentacles slightly 

 longer than lialf the lengtli of prostomium and arising near 

 each other. Palpi large, extending beyond tip of tentacles. 

 First body- segment twice as long as the succeeding ; tentacular 

 ciiTi sliort, the longest reaching to the 5tli segment. Para- 

 l)odia uniform ; lip of dorsal ramus conical, longer than that of 

 tlic ventral i-ainus ; tip of superior ligula conical, longer than 



