160 AET. II. B. IZUKA : 



a continuous row. Maxillae short and broad, with 5 or 6 teeth 

 on each. 



Epitocoiis phase : — In both males and females, there is no 

 distinctly marked posterior region of body. In the male, the cirri 

 of the first 4 pairs of parapodia are enlarged at their basal region. 

 The change of parapodia in form takes place in the male from 16th 

 segment, and in the female from 21st segment, posteriorly. Each 

 lip of dorsal ramus and the posterior lip of ventral ramus are en- 

 larged and form a flat skin-fold ; superior ligula conically pointed ; 

 inferior ligula enlarged and provided with a hook- shaped process ; 

 on the posterior side of the base of dorsal cirrus a small, and on 

 the base of ventral cirrus a trilobed, skin-fold is observed. Cirri 

 of the female simple ; dorsal cirrus of the male provided with 

 warts on its thickened basal region, and its terminal region ab- 

 ruptly tapering to a sharp point. 



Habitat : — Kanagawa in Prov. Musashi (Late Prof. K. Mitsu- 

 KUKi) ; Misaki (!) ; Toba in Prov. Shima (!) ; Satsuma (Late Prof. 

 K. MiTSUKUKi and Mr. J. Haea) ; Gulf of Miya in Prov. Owari. 



Nereis AgassirH Ehlers. 



PL I, fig. 9 ; PI. XVII, figs. 9—11. 



1868. Nereis Agassizi, Ehlers. Die Eorstenwiirmer, p. 542, Taf. XXIII 



Fig. 1. 

 1901. Nereis Agassizi, Johnson. Poljcliaeta of Puget Sound Region, 



p. 399, PI. IV, figs. 39—45. 



Body slender, broadest near prostomiam. Colour reddish 

 yellow in an alcoholic specimen. In living specimens, the dorsum 

 is anteriorly deep brownish in the female, and light bluish brown 

 in the male ; both sexes with fine brownish pigment spots scattered 



