166 AET. ir. A. IZÜKA : 



to which species McIntosh f says that the breeding season extends 

 from November till May and that he observed no indication of 

 swarming during those months. The same author farther states 

 that he obtained numerous postlarval stages of the species in or 

 near the mouths of the burrows in which the annelid lives. 



The worms which were collected by Koebl in the Gulf of 

 Miya in Prov. Owari and were identified with N, cUversicolor by 

 Maeenzellee, are in all probability N. japonica. The two species 

 resemble each other so closely that they might easily be 

 comfounded. Indubitable N. cUversicolor has never yet been met 

 ■with by me anywhere in Japan. 



Habitat : — Sumida Eiver in Tokyo (!) ; Gulf of Kojima in 

 Prov. Bizen (!) ; Kasaoka in Prov. Bittyu (!) ; Hinuma in Prov. 

 Hitachi (!) ; Gulf of Miya in Prov. Owari (!) ; Toba in Prov. 

 Shima (!) ; Shimizu Harbour in Prov. Suruga (!) ; Ito in Prov. 

 Izu (!) ; Yokohama (!) ; Kanazawa in Prov. Musashi (!) ; Chôshi in 

 Prov. Shimosa (!) ; Isumi Eiver in Prov. Kazusa (Mr. T. Suzuki) ; 

 Bay of Matsushima and Same Harbour on the east coast of 

 Northern Japan (!) ; Lake Bousset in Sakhalin (Prof. I. Ijima). 



Remarks : — Nereis Japonica is one of the most common littoral 

 annelids in Tokyo and vicinity, where it is extensively used as 

 bait, and is locally known under the name of " Gokai." It is also 

 very common in the Gulf of Kojima, Prov. Bizen, and in Hinuma, 

 Prov. Hitachi. In the former locality, it is known under the name 

 of " Umibiiru " and in the latter by that of " Kanko." In both 

 these localities the mature worms are largely used as manure. 



Breeding habit : — The swarming of the mature worm in the 

 Kojima Gulf occurs during the month of December, usually in 



t McIxTOSH : — On the Eeproduction of Nereis cUversicolor. (Ann. and M.ag. Nat. Hist., 9 

 series, Vol. 20, p. 176, 1907). 



