Z ART. II. A. IZUKA : 



indubitably synonymous with the older species E. indica Kinberg 

 and G. goes'i Mge. respectively and which therefore have to be 

 added among the former. 



Mv own researches have revealed fifty more species not re- 

 corded before from Japan. Of these thirty-two seem to be new 

 to science. 



Thus, there are in all one hundred twenty-four species to the 

 Errantiate Polychsete fauna of Japan as at present known. 

 These are referable to fourteen families and forty-five genera. 

 Now, in this paper I propose to describe and to comment upon 

 all the aforesaid 124 species, though in a few cases of deep-sea 

 forms collected by the " Challenger " and the " Albatross," and 

 reported upon by W. C. McIntosh and J. P. Moore respectively, 

 I have as yet failed to acquire specimens myself and have thus 

 been compelled to take recourse to merely making extracts from 

 the original descriptions. 



The Polychseta Sedentaria will be dealt with in a separate 

 contribution. So likewise the pelagic forms belonging to the 

 families Alciopidse and Tomopteridse, of both which families not 

 a single species have yet become known from the Japanese 

 waters. 



The material, upon which my own studies were based, have 

 been brought together mostly from within the littoral zone of the 

 main islands of Japan. A small part of them was obtained by 

 dredging at moderate depths (down to about 30 fathoms), and a 

 yet smaller part was taken from stones, sponges, etc., brought up 

 by the " long-line " from depths running down to about 450 

 fathoms in the Bays of Sagami and Suruga. Most extensive and 

 thorough collecting was done by myself in Misaki and neighbour- 

 hood, during my repeated sojourns during a period of several 



