10 AP.T. 12. K. YKXDO. 



communicate. Tlie coasts of some of the provinces consist in 

 the greater part of sandy beaches, and consequently only a few 

 species have been reported from them ; such species are either 

 not considered in the table, or they are attributed to the 

 neigh])ouring provinces. This will not cause any deception in 

 discussing the distributive features at large. 



T should here confess that the material in our hands by no 

 means covers all the existing sj^ecies on our coast. The southern 

 seas, esj^ecially, may supply us with no small number of species 

 as yet unknown, as has been hinted above. However, the data I 

 have been able to procure up to date are ample enough to give 

 sufficient knowledge of the distribution of the family along the 

 coast of Japan. A few remarks on the facts shown in the table 

 will not be superfluous if added here. 



1. The species which belong to the genus Fucus are 

 strictly limited to the coasts of Hokkaido and the Kurile islands. 

 Pelvetla has similar limitations. But the latter does not occur 

 in the northern Kuriles, and one of its formée extends, though 

 in a less luxuriant state, as far south as Kinkwasan Island. 

 These two genera may stand as representatives of the region 

 extending from the Kurile Islands to Kinkwasan Island. Besides, 

 Cystophyllum geminaium, (J. crassipes, C. hahodatense, Sargassum 

 Kjellmanianv.m and S. Thunhergii f. latlfolia are confined to 

 the same region. 



2. Sargassum is quantitatively as well as qualitatively poor 

 along the northern coast of Hokkaido. It is especially interest- 

 ing to note that on the northeast coast of Hokkaido we find 

 only two cold-sea forms of Sargassum, S. Kjellmanianum and S. 

 Thunhergii f. latifolia. Sargassum Horneri, S. Ringgoldianum, 

 S. énerve, Oifslophyllum sisgvihrioides, etc., are the most common 



