200 AET. II. A. IZÜKA : 



sKglitly shorter than the length of prostomium ; the superior pair 

 arises from the anterior end of prostomium, while the inferior pair 

 arises a little more posteriorly on the ventral surface of same. 



Body slender, consisting of 150 — 192 segments, 30-39 mm. 

 long, and 1.5-1.8 mm. broad in the anterior region of body. 

 The breadth of body segments is about 4 times their length in 

 the anterior parts of body, and about 6 times that in the middle 

 parts. 



Four pairs of tentacular cirri borne on two segments ; three 

 pairs of them are on the anteriormost segment formed by 

 fusion of the first and second body-segments and which is IJ 

 times as long as the next following segment. Of these tentacular 

 cirri, the postero-dorsal is the longest, and the postero-ventral the 

 shortest. Their form is not cylindrical, but is much flattened and 

 tapers distally. The anterior margin of the segment referred to 

 above has in the middle a process which is applied to the posterior 

 border of the prostomium. 



The next following segment bears a pair of tentacular cirri 

 slightly longer than those of the anteriormost pair. Under them 

 the segment carries parapodia with ventral cirrus. 



Parapodium short and conical, with longer anterior lobe and 

 shorter, simple, roundish posterior lobe. Dorsal cirrus somewhat 

 cordate ; those on anterior parapodia rounded, with symmetrical 

 ventral prolongations ; those on posterior parapodia shorter and 

 broader, with the outer ventral prolongation longer than the inner. 

 Ventral cirrus reniform, with convex outer border. 



Bristles transparent, about 14 in a bundle ; each with rather 

 short end -piece, and with shaft showing many long spines. Anal 

 segment with 2 anal cirri. 



Habitat : — Misaki (!) ; Yenoshima (Maeenzellee). 



