34 ATIT. II. — A. IZUKA *. 



JPolynoë longissima n. sp, 



PL I, fig. 1 ; PI. IV, figs. 1—5. 



Body extremely elongate, measuring 93 mm. in length, 3 mm. 

 in maximum breadth on the ventral surface of 15th segment and 

 7 mm. between ends of parapodia. 



Prostomium (PI. IV, fig. 1) boldly hexagonal, slightly wider than 

 long, with one side forming the posterior border and with two 

 opposite lateral corners forming prominences on which are situated 

 the anterior eyes. The posterior eyes are smaller and are situated 

 near the postero- lateral corners. Both pairs of eyes black and 

 circular. Ceratophore of median tentacle is slightly larger than 

 that of lateral tentacle ; the style with a slight basal enlargement, 

 beyond which it gradually tapers, and again enlarges to form a 

 subterminal bulb, which bears a delicate terminal filament of about 

 J the length of the entire style ; colour of the style in living 

 specimens pink white with a light brown ring on the distal half 

 of the subterminal bulb ; the ceratophore also with brownish 

 pigment. 



Lateral tentacles slightly shorter than the median ; their styles 

 without basal enlargement ; the ceratophores and styles same in 

 colour as the median tentacle. Subtentacles extend a little beyond 

 terminal filament of the median tentacle, gradually broadening 

 for the first J of their length and then gradually tapering to the 

 end ; colour light yellowish with a light brownish subterminal ring. 



Tentacular cirri with styles similar to those of lateral tentacles 

 in form and colour, hut with longer styles. Dorsal tentacular 

 cirrus slightly exceeds the ventral in length. 



There exist 129 somites, exclusive of the pygidium. Body 



