172 AEÏ. II. A. IZUKA : 



in form according to regions of the body ; thus in 13th para- 

 podium, the superior hgula is lanceolate, and from its dorsal 

 base arises the dorsal cirrus with broad base, and from 

 a more proximal position a somewhat conical dorsal process. 

 Ventral ramus, with elongated pre- and post-setal lobes (or 

 lips), nearly as long as the dorsal ramus ; inferior ligula shorter 

 than setal lobes ; ventral cirrus small, arising from base of 

 parapodium. 



In about 50th segment, superior ligula is much enlarged, the 

 dorsal process somewhat elliptical in outline, and the dorsal 

 cirrus shortly filiform. In the posterior region of body, the 

 superior ligula becomes relatively more elongated dorso-laterally, 

 wliile the parapodium itself becomes smaller posteriorly. 



Bristles are entirely of the setose kind, more dor sally with fi.nely 

 haired longer blade, and more ventrally with relatively coarser 

 haired, shorter and broader end-piece. Aciculœ two, black. 



Proboscis stout. Paragnathi distinct : I. 1 or 2 ; II. an oblique 

 band consisting of about 3 rows ; III. a group of 6 — 8 small ones ; 

 IV. in curved groups of 17 — 20, convex on the outside ; V. a 

 single pale-coloured piece ; VI. in circular groups ; VII., VIII. in a 

 continuous transverse band, consisting of many irregular rows. 

 Maxillae brownish black, with 11-12 teeth below terminal fang. 



No structural diiference is observed in parapodia between 

 the atocous and the epitocous phase of this species. 



Habitat : — ? Yokohama (Makenzeller) ; Misaki (!) ; Miyazu in 

 Prov. Tango (!) ; Gulf of Kojima in Prov. Bizen (!). 



Remark : — In Kojima Gulf and its vicinity, this annelid is 

 much used as ]:)ait, and is known under the name of 

 " Chibiiru," so called on account of the red colour of the animal 

 in livini:c state. 



