ERRANTIATE POLYCHAETA OF JAPAN. 159 



Tentacular cirri slender, all extending beyond tentacles ; the longest 

 one reaching to the 15th segment, when laid backwards along 

 the body. 



Anteriorniost 4 pairs of parapodia with closely laid rami, 

 having pointed lips and ligulae. The next 5 or 6 pairs of para- 

 podia with thicker rounded lip to dorsal ramus, and thinner lip to 

 ventral ramus ; with thick, rounded superior and inferior ligulae, 

 both which reach laterally to about same extent. 



In still next following parapodia, the two rami are widely 

 separated ; the dorsal ramus with conically pointed lip, the ven- 

 tral with 2 similar and somewhat shorter lips ; superior ligula 

 slender, conically pointed ; inferior ligula half as long as the 

 ventral ramus. Dorsal cirrus in all segments hliform, extending 

 far beyond the ligula. 



In posterior parapodia, dorsal cirrus arises near the end of 

 ligula and is longer than that in more anteriorly placed parapodia. 

 A^entral cirrus arises from base of parapodium and is shorter 

 than the ventral ramus. Dorsal bristle-tuft composed of a series 

 of ordinary setose bristles, and of a single blackish hook (PI. XVII, 

 lig. 8) of the characteristic form. Ventral ramus bears setose 

 ])ristles similar to those of dorsal ramus and short falcate bristles 

 (PI. XVll, (ig. 7). 



Anal segment sliort, divided by radial furrows, and with 

 2 triangular leaf-like appendages, one at base of each slender anal 

 cirrus. 



Proboscis short and thick. Paragnathi very small and of a 

 light l)rown colour : I., 11. absent ; IV. in dense comb-shaped 

 rows forming ;i triangular group ; III. in a transverse group ; V. 

 absent; VJ. in a sliorf double row; Vlh, VIII. in 6 small, dis- 

 tinctly <livi(l('d groups, forming just behind the maxillary ring 



