EERANTIATE POLYCHAETA OF JAPAN. 161 



all over dorsal surface of body ; ventral surface pinkisli yellow 

 in female, and pinkish white in male. 



Length 50 — 70 mm., consisting of 80 — 100 segments, breadth 

 about 4 mm. without, and G mm. with, parapodia and bristles. 



Prostomium broader than long ; tentacles slightly shorter 

 than prostomium separated at base ; palpi large and thick, each 

 with a large terminal boss, which extends a little beyond 

 tentacles. First segment almost twice the length of the 2nd, 

 Tentacular cirri long, all extending beyond tip of palpi, the 

 longest reaching to 14th segment. 



First 4 pairs of parapodia with pointed ligulae and lips. 

 The next following 4 or 5 pairs of parapodia with ligula and lip 

 of dorsal ramus rounded at end ; lips of ventral ramus compressed 

 and narrow. In all the remaining pairs of parapodia, the two 

 rami are widely separated, and the lip of dorsal ramus is twice as 

 long as the short lip of the ventral ; the superior ligula is slender, 

 conical, and longer than the lip of dorsal ramus, while the inferior 

 ligula is as long as the ventral ramus. Bristles with setose or 

 short falcate (fig. 11) end -piece ; in dorsal ramus 1 or 2 

 (sometimes 4) strong liooks (fig. 10). Dorsal cirrus enlarged in 

 basal region, longer than superior ligula ; ventral cirrus as 

 long as inferior ligula. Anal segment globular with a pair of long 

 and slciidcr anal cirri. 



Proboscis short. Paragnathi small : I., II. absent ; ÏV. in a 

 iriaii.gnlai- groii[) ; 111. a rcnindish group of comb-like rows; V. 

 absent; A' I. two ti-an.^verso rows; A^ll., YIII. a continuous band 

 of li distinct, small, donltlc-rowed groups, very near to the posterior 

 boundary of tlio maxillary division. Maxillae short and broad, 

 with 0—7 toetli. 



The tul (■ in wliidi tliis annelid lives is leatherv, and rather 



