40 ART. II. — A. IZÜKA : 



Habitat : — Suruga Bay, GO-70 fathoms (" Albatross "). 



Polynoë magnacomuta Moore. 



1903. Hylos3^ncLi magnacovnnta Moore. Proc. Acad. Nat. Sc. Philacl. 

 Vol. LT, p. 419, pl. xxiii, fig. 18. 



J. P. Moore's type is the only specimen as yet obtained of 

 this species. It consisted of prostominm and 26 anterior segments. 

 I take the following from his description : 



Prostominm abont 1 J times as long as broad ; both anterior 

 margins divided by a median dorsal groove, but this disappears 

 on vertex ; anterior lobes broadly ronnded, continuons with bases 

 of lateral tentacles. Eyes widely separated, small, black ; those of 

 anterior pair lateral in position and nearer anterior than posterior 

 prostomial margin ; those of posterior pair smaller, quite dorsal in 

 position, separated from prostomial posterior border by about twice 

 their diameter and from each other by about 7 times their dia- 

 meter. Tentacular styles all lost, their ceratophores small ; lateral 

 tentacle arises without definite demarcation from anterior prosto- 

 mial lobes ; base of all tentacles deep chocolate brown in sharp 

 contrast to colourless prostomiam. Subtentacles very large, 

 about 6 times the length of prostominm and in their thickest 

 part more than J the width of same ; their base constricted at 

 the point of origin beneath prostominm ; gradually thickening 

 in the first \ of their length, after that tapering to the long 

 slender tip. 



Tentacular cirri lost. 



Nephridial papillae begin on 5th segment. 



Parapodia long, slender, tapering with a gentle curve to the 

 slightly bilobed tip. Ventral ramus divided by a vertical cleft 



