178 ART. II. — A. IZUKA I 



being much longer than the ventral ramus ; inferior ligula, extends 

 to the tip of the latter, and ventral cirrus, which is more slender 

 than that of the 1st parapodium, is a little shorter than the 

 ventral ramus ; aciculas two ; bristles (figs. 16, 17, 18) in part with 

 short setose, and in part with falcate, end-piece. 



In the 30th parapodium (fig. 14), the dorsal border of dorsal 

 ramus shows a flap -like enlargement between the body and the 

 base of dorsal cirrus ; the middle ligula is more prominent than in 

 preceding parapodia, the ventral ramus as well as dorsal and 

 ventral cirri remaining nearly the same. 



In the 5th parapodium (Fig. 15), the shape of dorsal 

 ramus becomes slightly changed, indicating decrease in size 

 of the parapodium itself ; both dorsal and ventral cirri are 

 relatively long ; base of middle ligula with a slight con- 

 striction. 



The body cavity and its extensions into parapodia are almost 

 entirely filled with sexual element, the eggs. 



Anal segment short and broad, Avithout anal cirri. 



Proboscis stout. Paragnathi : I. 3 in a longitudinal line ; II. 

 in 3 oblique curved rows (16 — 18 paragnathi in total), with the 

 convex side turned mediad ; III. transverse band of densely arranged 

 minute ones ; IV. 25 — 28 in a curved group ; V. absent ; VI. in a 

 circular group of 7 or 8 ; VII., VIII. in a transverse band of larger 

 anterior and smaller posterior paragnathi. Maxillae slender, dark 

 amber coloured with sharp black tip, with indistinct serration. 



Habitat : — Yuriagé in Prov. Piikuzen, found in a dead gaste- 

 ropod shell. (Prof. I. Shishido). 



