56 AET. II. — A. IZÜKA : 



large, gradually tapering toward tip, 5^ times as long as pro- 

 stomium. All tliese organs arc smootli. 



Tentacular cirri slender, tlieir tip nearly reaching to that of 

 median tentacle, cirriphore with two short setose bristles. 



Parapodinm (fig. 4) long, somewhat conical ; the dorsal ramus 

 attached to the dorso-anterior side of ventral ramus, the lateral 

 side of which slants down ventrally. Ventral cirrus short, 

 arising near the ventro- lateral angle of ventral ramus, and 

 extending a short distance beyond the angle just mentioned. 

 Dorsal cirriphore large ; it arises from the dorsal border of para- 

 podium just opposite the root of ventral cirrus, and reaches to 

 tip of parapodium ; the style long, tapering to tip, and about 

 three times as long as ventral cirrus ; its surface sparsely 

 papiliated. Above the origin of dorsal cirrus and on cirriferous 

 parapodim, there exists a large protuberance, about twice as broad 

 as dorsal cirriphore. The dorsal and ventral rami have each on 

 tip a sharp conical process into which the aciculum enters. 



Elytra in 16 pairs, borne on segments 2, 4, 5, 7 21, 



23, 26, 29, 32, 35. They are rather small and leave a median 

 longitudinal part of the dorsum uncovered ; generally of an elongate 

 shape with convex posterior and concave anterior border (fig. 3) ; 

 only those of the anteriormost two pairs are of a roundish outline. 

 Each elytron provided with cilia on the lateral margin ; the surface 

 covered with short and small papillae, which are especially dense- 

 ly crowded in the posterior parts. 



Dorsal bristles (fig. 5) strong, slightly curved, provided with 

 dense row^s of spikes. Superior ventral bristles (fig. 6) with about 

 15 rows of spikes below the smooth and hooked tip ; inferior 

 ventral bristles (fig. 7) much smaller, with about 10 rows of spikes 

 below the hooked tip. 



