EKKANIMATJ-: rOLYClIAETA OF JAPAN. 67 



Dur.sal sui-raco of body reddish brown, fading- latorally into 

 palo-wlritc in tlio niiddlo of parapodium. Botli tlio anterior and the 

 })oöierior ayi)ects of tliu latter are colourless. Posteriorly from 

 about the öOtli se,ü;nient the colour of the dorsum becomes gradually 

 lighter. Ventral surface pale brownish, with exception of a pale 

 median longitudinal band. 



Prostomium (PI. \' 111, lig. 7) not well distinguishable from the 

 comparatively hirge ommatophores, which are pointed anteriorly and 

 sliglitly laterally. Poth tlie cephalic lobe and the ommatophores 

 are of a brownish black colour. The tip of each ommatophore 

 shows a whitish round lenticular area. Median tentacle small, 

 being only about ;î the length (_)f prostomium ; it arises close to 

 the [)osterior boundary of the latter. Lateral tentacles nearly black in 

 colour except the whitish boss at the end of each. Subtentacles pro- 

 longed beyond the front end of in'ostomium about as much as it is long. 

 Their colour is l)rownish l)lack at l)ase, gradually fading into hght 

 lii'own towards the tip ; this ground colour is interrupted by four 

 Itlack bands, which form incomplete rings open on the dorsal side. 



Tentacular cirrus on each side consists of a cirriphore bearing 

 two styles, of which the anterior is the shorter. 



l'ara podium of the siiape of a, truncated cone, flattened antero- 

 posteriorly. P)oi'sal cii'rus. consisting of a ciiTi})h.ore and a short 

 style, not longer than llie longest of the l}ranchial tubercles, which 

 are (listi'ii)ute(l o\-er the doi'sal suriact' of the parapodium, Ven- 

 ii-al cirrns, proxideil \\illi a eirri|ihoi'e, of such a length tliat its 

 lip I'eaches nearls' Iml no! (juite 1 he distal end oL" the })arapodiu]n. 

 AnnlJie risolaleil [);i|>illa is found in lh<' lower part of the [>ai'a[)o- 

 (jinni, i>n bolii tlie unlerior and llie postei'ior siii'rac(>s. 'llu'])ara,- 

 jdidinni shows nn (lie dni'sal side, a lnw itrolnheranec. i'ej)resenting 

 Ihe ivnniani r.\ I ho dorsal I'amus. 



