ERRANÏIATE POLYCHAETA OF JAPAN. 197 



in tlie centre of tlie posterior sinus of prostomium. 



Body consisting of about 350 segments, much elongated 

 (190 — 200 mm.), convex dorsally and flattened ventrally, tapering 

 a little anteriorly and move distinctly so posteriorly. Posterior end 

 with two rather stout anal cirri. Segments transversely ringed, 

 shorter and broader anteriorly than posteriorly. The cuticle is 

 remarkably iridescent, and there is a median series of blackish 

 specks on dorsum. A conspicuous dark belt on the upper 

 and anterior edge of the pedicle of parapodium. Ventral surface 

 with dusky pigment and thrc;e rows of specks, the median speck 

 being pale. The proboscis in extrusion is long, dark, and clavate ; 

 the basal parts covered with small papillœ, the distal parts with 

 numerous l(3w transverse papillœ, and the terminal disc with 

 about twenty- one papillae. Anteriorly situated dorsal cirri are 

 reniform or ovate ; those on thirtieth parapodium elongate- 

 ovoid, and those on sixtieth wide in the upper part, so that the 

 whole process forms a broad flap. More posteriorly, they again 

 diminish in width so as to resemble an acuminate leaf. Setigerous 

 process somewhat clavate, with bifid tip. Bristles pale, slightly 

 curved at distal end of shaft which has minute spines on the 

 terminal ridges and over tho surface. The terminal blade is of 

 a modei-ato length, ol)li(iuely striated, the edge boldly serrated. 

 'I'hc ventral lamella is almost I'eniform in front but becomes 

 ovato-acuminate behind. Anal cin-i sul)ulate. 



rroT)OScis in (extrusion with six rows of papilla? at base, 

 and from sixteen to twenty-one papillœ at junction with 

 stomach. 



Habitat: — Oil" "Moioiso near Misaki, 14 fathoms (!) ; Tomo 

 Harbour in Prov. l5ingo(I). 



