110 a];t. u.— a. izuka : 



Genus Diopatra Aud. ut M-Edw. 



Prostomium witli '1 anterior short and thick, and 5 posterior 

 long, tentacles provided with ringed ceratophore. Eyes 2, situated 

 between unpaired and paired middle tentacles. Peristomium simple, 

 with 2 tentacular cirri. Branchiae plume -like. Tube consists 

 of various material. 



JMopatrn sugoUal n. sp. 



PL I, fig. 6; PI. XI, figs. 13— 1(). 



Body consisting of about oOO segments, measuring 4")0 mm. 

 in length, and 10 mm. in breadth including parapodia at about 

 30th segment. 



Prostomium small but distinct, with 2 short anterior and 

 5 long posterior tentacles. The unpaired median tentacle is the 

 longest, its tip reaching to the anterior margin of 9tli segment, 

 and its ceratophore taking up about i- of the entire tentacle 

 length ; the anterior short tentacles about equal in length to the 

 median tentacular ceratophore. A pair of palpi stout. Eyes 

 scarcely visible. Peristomium with 2 small tentacular cirri. 



Branchiae plume-like ; they begin to exist usually froin the 4tli 

 and very rarely from the 5tli segment. They attain their maximum 

 length of 15 mm. on the 5th segment ; after that they gradually 

 diminish in length posteriorly and entirely disappear on about 

 70tli segment, xlnal segment with 2 short and 2 long anal cirri. 



Colour of living animal reddish brown, the dorsal surface 

 of the anterior portion of the body being tinted by deep bluish 

 pigment and sliowing strong iridescence ; the ventral surface 

 of a light })ink colour with yellowish shade, faintly iridescent. 



