4 AET. II. A. IZUKA : 



Of the said 40 species, 3 are cosmopolitan, while 4 belong to 

 southern, 8 to tropical, 25 to northern (iticluding (3 arctic) 

 forms.* 



The 4 southern forms are those that occur in the south of 

 Australia, in Kerguelen Island, and in the south Atlantic Ocean. 



Among the 25 northern and arctic species, there are 9 that 

 are found along the Pacific, but not on the Atlantic, coast of 

 North America, though 5 out of that number are found on the 

 north European coast. The remaining 16 are those that are known 

 to occur in the Mediterranian Sea and on the coast of western 

 Europe, including England, Iceland as well as Greenland. Again, 

 6 of the number are those that occur also on the east coast of 

 North America. 



Of the 8 tropical forms, are found in the Philippines and 

 in the Indian Ocean, 4 of them extending their range to Zanzibar 

 and the British East Africa. The remaining 2 tropical forms are 

 those that have hitherto been discovered only in the Phihppine 

 Islands. The wide range of distribution of these tropical forms 

 may easily be accounted for by the course taken by ocean currents 

 ill different seasons along the coasts of the Philippines, India and 

 Africa. Indeed, I am strongly inclined to believe that, with future 

 advance of our knowledge, many more species will have to be 

 added to the list of those that are common to the Japanese 

 waters and the regions indicated. 



For an insight into the specific distribution of Polychaeta on 

 the coasts of Japan, the reader is referred to the table given at 

 the end of this chapter. In that table the localities are arranged 

 in the order which, beginning at the southern part of the Japan 

 Sea side, goes up northwards on that side as far as Sakhalin and 



* For names of the species see the table at the end of this chapter. 



