EREANTIATE POLYCHAETA OF JAPAN. 129 



to 2 on fil)0ut the 50tli. The branchiae are very different in 

 appearance from those of K. mucronata. 



Compound bristles rather stout, the terminal parts of the 

 shaft thickened for a short distance, with marginal denticulation ; 

 end-piece short, the tip hooked and distinctly bifid. Setose 

 bristles gently curved, with narrow denticulated wing. Pectinate 

 bristles wide, with about 11 teeth, the marginal ones of which 

 are subequally prolonged. Posterior hook rather strongly sigmoid, 

 the tip hooked, bifid, with a guard. 



Maxillary forceps slender, the posterior appendages small and 

 without constriction. Mandibular holders slender, about 2J times 

 as long as the calcareous plate ; the latter roughly triangular. 



Habitat : — Benin Islands (Mr. S. Hieota) ; Sagami Bay, 153 

 fathoms (" Albatross "). 



Eunice northioldes Moore. 



PI. XIII, figs. 17—18, 



1903. Eunice nortliioides, Moore. Proo. Acad. Nat. Sc. Pliilad., A'ol. LV, 

 p. 433. 



Body very littk' depressed and of a nearly uniform diameter 

 througliout the greater part of ln^dy ; dorsum higlily arched ; 

 ventral surface ncai'I}' (lat, with a deep neural groove. Number 

 of segments about sr» ; total length about 58 mm. ; and breadth 3.5 

 mm. excluding ])ai'a|)()(lia. 



Prostomiuiii. in (he alcoholic preserved specimen, strongly 

 i'e(r;icfc(| wit hill ])(n'istoiniaI fold, concealed for about ^ its total 

 length. The (o|;il length o'i tlie ])i'Ostonium is IJ times the first 

 segment. Eyes 2, lai'ge. brown, lielow base of inner tentacles 

 aiul behind that of outer lateral tentacles. Tentacles strongly 



