ERRANTIATE POLYCHAETA OF JAPAN. 211 



the same in form as frontal tentacles, arising from between the 

 ■anterior halves of the eyes, and not reaching to the anterior end 

 of prostomium. Tentacular cirri in four pairs, arranged in two 

 vertical rows on each side ; ceratophores rather long ; anterior 

 dorsal tentacular cirrus with rod-like style ; the anterior ventral 

 one with slightly flattened and distally tapering style. The two 

 posterior tentacular cirri with elongate conical style of nearly 

 twice the length of the anterior ventral pair. 



Arising from the ventro-lateral parts of the posterior end of 

 prostomium are four long and somewhat flattened appendages on 

 <^ach side, of which the outermost and the innermost are a little 

 shorter, and the middle two a little longer, than prostomium. 



Para podium l)iramous, with short dorsal and long ventral 

 ramus ; dorsal acicula much smaller than the ventral, which 

 latter supports a bundle of 18-23 setose bristles ; upper end of 

 shaft with 7-8 spines on each side ; end -piece finely serrated for 

 the greater part. 



Dorsal cirrus very large and somewhat reniform ; ventral 

 cirrus small and also reniform, vertical in position, arising from 

 the middle of the postero- ventral side of parapodium. 



Anal segment with 2 anal cirri. 



This specie's comes close to Xotophijllum Imhvlcatum Moore 

 (Proc. Acad. Nat. Sc. Philad., 1906, p. -217), hut differs from it 

 iu the foi'm of prostomium and in i\\(' structure of tentacular 

 <'irri, especially of the anterior dorsal j)air; and also in number 

 us well <is in relative length of the posterior appendages arising 

 from beneath the posterior margin of prostomium. 



Habitat : — Yodomi in Sagami Pay, 40 fathoms (Mr. K. Aoki). 



