EEP.ANTIATE POLYCHAETA OF JAPAN. 9 



Dorsum of a bluish gray colour, with two or three reddish, 

 parallel, transverse linos running near and along the posterior 

 margin of segments ; but these lines do not extend laterally to 

 parapodial bases. 



Ventral surface lighter in colour and of a somewhat yellowish 

 tint. 



Prostomium (pi. Ill, fig. 1) appears elongate on account of the 

 fact that lateral tentacles are direct continuations of its anterior 

 border. The median furrow does not reach to the posterior border 

 of prostomium. Eyes of the anterior pair lie near lateral margin 

 in the broadest part of prostomium ; the nuchal collar encroaches 

 much upon tlie latter, so as to almost cover the posterior pair of 

 eyes, which are only partially noon on tlie dorsum as indicated by 

 the dotted lines in tlie figure. 



Median tentacle does not reach to tip of subtentacles ; its 

 basal region is much onci'oaclied upon by the base of lateral ten- 

 tacles ; the style smooth with a distinct subterminal bulb and a 

 terminal filament. A similar featuie is shown l^y all other tentacles 

 and tentacular cirri, which are likewise smooth tlu-oughout. Sub- 

 tentacles large and thick, showing a well marked inferior ridge ; 

 they are largely exposed on cacli side of tlie l)ase of lateral tentacles. 

 Tentacular cin-i. with very long (Mi'riplior(\ arc thrust considerably 

 outward. 



Dorsal ciiTi cxlciul latiM'ally a little beyond the bundles of 

 ventral lii'istles. Each of Ihcni with a distinct suhtcnninid ])nlb, 

 and a pale tcrniiiial hlaiiiciil. 



Elytra in ] J pairs, hoi ne on segments 2,4,5, and so forth on 

 every alternate segment down to segment 2^) inclusive. The elytron 

 is of a (lull lead gray colour, with an oval white spot over the 

 point of attachment. Us sui'I'ace is niinntely |)apill(\se when seen 



