EERANTIATE POLYCHAETA OF JAPAN. 229 



large cluster af Lepas anatifera was attacliecl. 



(»enus Xotopygos (J rube. 



ViOdj ol)long or vorniiform, with a pair of short and stout 

 processes at posterior extremity. Prostoinium Avith 3 tentacles, 

 2 su Intenta cles and 4 eyes. Caruncle thick. Parapodium biramous, 

 tfte rami very distnict. Dorsal cirri 2 in each segment, one simple 

 jind the other biarticulated. Branchiae fihform or pinnate, in 

 cluster. Amis opens in adult worm dorsally on a segment apart 

 from the posterior extremity. 



Xotoj)i/f/os mitsiû^urii n. sp. 



PI. xxir, figs. 10—11. 



The following description is l)ased on an unique specimen 

 found in a collection made by tlie late Prof. Mitsukuei in April, 

 1901, at Inanzé, off Xaha in Okinawashima, one of the Loo-Choo 

 Islands. 



The specimen was preserved in alcohol, so that the original 

 colouration of the animal can not 1)0 told, It shows only 

 brownisli }>igmentation in the anteri(X' margin of dorsal bristle- 

 papilla?, deeper in anterior segments than in those posteriorly 

 placed. 



Pody elongate, somewhat tetrago]ial in cross-section, consist- 

 ing of 31 setigerous segments in addition to the very short post- 

 • ■liormost segment, Nvliieh bears two sliort and broad terminal 

 styles. 1( measures 48 mm, in length, 8 mm. in ' breadth and 

 .". 111111. in lliickiicss at about tlie middle parts of the body. Both 

 <lorsai an«l ventral surfaces slightly convex; segmental junctions 

 more distinct <^n Wiv latter than on the former, which exhibits 

 irregular, somewhat oblii^nely directed wrinkles. 



