62 ART. II. — A. IZÜKA : 



narrowest part of prostomium at the posterior border, anterior to 

 which the lateral borders diverge. The prostomium swells 

 abruptly at about tlie middle into prominent rounded lobes bearing 

 the anterior pair of eyes. Ceratophores of tentacles nearly 

 spherical ; style of median tentacle lost ; lateral tentacles very 

 short and thick, ovate pyriform and slightly pointed, scarcely 

 longer than their ceratophore, their breadth equal to half their 

 length. Subtentacles slender, about 2| times as long as pro- 

 stomium, Eyes very large, but lightly pigmented ; the anterior 

 pair situated on the ocular lobes, the posterior slightly more 

 caudad and mesiad and nearly in contact with the anterior. 



Of tentacular cirri, the ventral ones alone remained ; about J 

 as long as subtentacles. 



Ventral surface smooth. No visible nephridial papillae. 



Parapodia large and prominent ; ventral ramus much larger 

 than dorsal ramus, broad, flat, leaf-like, its lateral margin broadly 

 rounded, the ventral margin convex and the dorsal margin con- 

 cave ; at the end splitting into two very thin vertical plates. Dorsal 

 ramus a rounded lobe arising from about the middle of the 

 anterior side of the dorsum of ventral ramus. Dorsal cirriphores 

 remarkably large ; styles scarcely reaching beyond tip of ventral 

 ramus. Ventral cirri with short globular cirriphore ; style 

 thickened basally liut with filiform distal end, their tip just 

 reaching the inferiormost ventral bristle. 



Dorsal bristles few in number and irregularly arranged ; they 

 are slender, rather strongly curved, pointed, with transverse rows 

 of exceedingly fine teeth along the convex border (fig. 17). 

 Ventral bristles arranged in a single vertical series which spreads 

 out in a fan-like manner, slender, very long, somewhat enlarged 

 and Ijent below the thin, tapering, very finely serrulate, and 



