EEEANTIATE POLYCHAETA OF JAPAN. 155 



Epitocovs phase : 

 1843. I Hetsronereis arctica. Oersted. Grönlands Ann. dorsibr., p. 27. 

 1843. ^ „ assimilis Oersted. Ibid., p. 28. 



1843. Nereis grandifolia, H. Ratlike. Beitrüge zin- Fanna Norwegens, 



p. 155. 

 1865. J Ç Heteronereis grandifoli;t, Malmgren. Nordiska Hafs. An- 



nnlater, p. 108, Tl. XI, figs. 15—16. 



1867. Heteronereis grandifolia, Malmgren. Annnl. Polycli., p. 60, 

 PL V, fig. 31. 



1868. Nereis pelagica, Elilers. Die Borstemviirmer, p. 511, Taf. XX, 

 Fig. 11—12. 



Body broadest in tlie middle region; GO — 80 segments. Length 

 40 — 55 mm. ; breadth 4.5 mm. without, and 6 mm. with, bristles. 



Prostomium longer than broad, slightly longer than the first 

 body- segment ; tentacles scarcely half as long as prostomium ; 

 palpi longer thaa prostomium, extending beyond tip of tentacles. 

 The first seo-ment twice as lono- as the next followino- tentacular 

 cirri short, the longest reaching to the 5th segment. 



Parapodium uniform, the two rami lying closely together ; lijD 

 of dorsal ramus obtusely rounded or moderately pointed ; same of 

 ventral ramus as broad as that of dorsal ramus, similar in 

 length ; bristles with either falcate or short setose end -piece. 

 Super ioi- ligula obtusely conical, not longer than the lip of dorsal 

 (or superior) ramus ; inferioi- ligula short and rounded, about 

 li;ilf lh<' l(Migth of the lip of ventral ramus. Dorsal cirrus 

 siin|)le: arising, in tlie anteriorly placed segments, from the 

 middle of tlie dorsül margin of parapodium, and in the posteri- 

 orly ] »laced segments, from a point nearer to tip than to base 

 of parapodiinii, ;ind extending far l)eyond the ligula. 



Ventral cirrus arising from base of parapodium, almost as 



