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 aigae in Siapan 



K. Yendo 



A glance at the map will show the 

 islands of Japan extending like a festoon 

 along the Asiatic coast from lat. 2 2° N. 

 to lat. 51 N. The southern islands of 

 the series are warmed by the tropical 

 current, while the northern shores re- 

 ceive the cold stream from Behring sea. 

 Accordingly the marine flora, tropical 

 in southern Japan, changes to arctic as 

 one travels northward. 



Before entering upon the details of 

 algal distribution, it will be well to 

 explain the course of the prevailing 

 ocean currents along the coast of 

 Japan. They may be briefly described 

 as a warm and a cold current. The 

 warm current is the main north equa- 



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