EKRANTIATE POLYCHAETA OF JAPAN. 207 



Eulalia albopicta Marenz. 

 1879. Eulalia albopicta, Marenzeller. Südj%p. Auuel., p. 20. 



Body, consisting of 77 segments, measures 18 mm. in length 

 and about 2 mm. in breadth including dorsal phyllodes (cirri) 

 of both sides. It tapers anteriorly less than posteriorly. Colour 

 reddish gray. Dorsum darker than ventral surface and cirri. 

 On dorsal surface, each segment shows transversely elongate white 

 spot, at first in single number and after that mostly in twos, but 

 without regular order. 



Prostomium more than li- times broader than long, with 

 roundish pentagonal outline. The anterior margin indented in 

 the middle. Superior pair of tentacles conical and as long as 

 prostomium ; inferior pair of same arising from ventral surface of 

 l^rostomium. MediaL. tentacle arising from the middle of the 

 dorsal surface of prostomium, somewhat longer than the paired 

 ones. Eyes 2, large, round, with an indication of a lens in each, 

 placed nearer to posterior border tlian to anterior border of 

 prostomium. 



Tentacular cirri in 4 pairs : first pair as long as the breadth 

 of prostomium, borne on the first segment ; second and third 

 pairs borne on the second segment, which has a pair of rudi- 

 mentary parapodia with bristles ; the second pair of tentacular 

 cirri is the longest of all, reaching to the lltli segment; fourth 

 pair of tentacular cirri borne on the 3rd segment. 



The antoriormost 10 segments are short ; after that the length 

 quickly increases ; the ratio of length to breadth as measured on 

 the ventral surface being 1:0 or 1 : 7 in the anterior segments, 

 and 1 : 3 in tlic middle region of l)ody. 



