ERT^ANTIATE POTAT'TTAETA OF JAEAN. 137 



Tlio jaAV-apparatus is not well -developed. The maxillary 

 forceps, liaviug bifurcate tip and a lateral process in each, are 

 abont eqnal in len^ïtli to their posterior appendage ; paired dental 

 plates of both sides with 2 teeth each ; the unpaired left plate 

 with a pointed tip only ; the anteriormost paired jaw-pieces, which 

 are light ]")rown in colour, are rather broad plates. Mandibles 

 black, rod-lik'c, slender, posteriorly divergent, and each with a 

 broad membranous wing, wliich meets with that of the other 

 side in tlie median line. 



The muscular pharynx occupies ord-8th segments. In typical 

 segments tlie intestinal coeca enter into the cavities of branchial 

 filaments, branching dichotomously like these (figs. 6 and 7). 

 The body cavity as well as its extensions into branchial filaments 

 are filled with reproductive elements (either eggs or spermatazoa). 



Habitat :■ — This species was found creeping on the gills of 

 Macroclielra hacmpfcrl De Haan brought up fi'om a depth of 

 300-350 fathoms in Sagami Bay. 



(iemis Nhioë Kinberg. 



Prostominm conical, witli (M- without knol)-hke appendages ; 

 '2 autcrioi'most segments liavo no parapodia. A nnmlier of seg- 

 ments ])i'(ni(led witli 1)i'aiir'liiae. I'i'istlos of two kinds. Jaw-plates 

 ill e(|iial ninnber mi botli sides. 



Ninoë jmliufffa Moovo. 

 190.^. Xiiu.r. i,,,hn,i(,i, Mooro. Proc. Acad. Nat. 8c. riiilacl., Vol. LV, 



p. I.".*;, VI. xwi, fi-s;. (;,s-7i. 



The main clianieters of this species, as given by Mooee, may 

 lie stated as f<~tlIows : — 



