156 AET. II. A. IZUKA : 



long as the inferior ligula. Anal segment long, conical and simple, 

 with 2 slender anal cirri. 



Paragnathi stout, dark coloured : I. 3 in a longitudinal row ; II. 

 in a curved double row ; lY. in a semicircular group ; III. in a large 

 and rounded crowd ; V. unarmed ; VI. 4 (sometimes 7) ; VII., VIII. 

 in a dense transverse band. Maxillae stout, black, with 7 teeth. 



Epitocous phase : — In males, 7 anteriormost dorsal and 4 an- 

 teriormost ventral cirri thickened at base ; and suddenly from the 

 17th segment posteriorly the parapodia are enlarged. In females, 

 the change of parapodia in form and size occurs gradually from 

 the 18th segment posteriorly, the rami becoming outstretched, the 

 lip of dorsal ramus and the posterior lip of ventral ramus enlarged, 

 and the inferior ligula elongated. The skin fold along the inferior 

 side of dorsal cirrus is warty in males. On base of ventral cirrus, 

 there is found a simple skin-fold in females, and double skin-folds 

 in males. Anal segment enlarged. 



Habitat ; — Toba in Prov. Shima (!) ; Shikinejima, about 23 

 fathoms ; Misaki (!) ; Yokohama ; Choshi in Prov. Shimosa (Prof. S. 

 Goto) ; Miyazu in Prov. Tango (!) ; Mororan Harbour in Hok- 

 kaido (!) ; Sagami Bay, 63 fathoms ; Tötömi Sea, 34 fathoms 

 (" Albatross "). 



Nereis pusilla Moore. 



1903. Nereis pusüla, Moore. Proc. Acad. Nat. Sc. Philad., Vol. LV, 

 p. 428, PL XXIV, figs. 25—27. 



Body, consisting of about 50 segments, measures 20 mm. in 

 length and 2.2 mm. in breadth including parapodia. 



Prostomium longer than broad ; the preocular region little 

 narrower than the ocular ; anterior margin broad, truncate. Eyes 



