lin: Il ('A(i:.v, <>i- .iai'A.n. 18 



7. TIk' Ocholsk a'idi' ol' Hokkaido cxhihits iio peculiarity 

 in .s})ecilic distrilmtion, l)ut shows to a certain extent the cliar- 

 acteristic features of both the l^iciiic and the dupan Sea sides. 

 It should he remembered that Sargassiim confnsum, which is 

 undoubtedly found in the Tsushima current, also exists on the 

 Dchotsk side of Hokkaido as far north as the southern Kuriles. 



(S, On the P;icific side, m:iny of the warm-sea forms cease 

 to grow in the region north of the l*rovince of Rikuzen ; and 

 the cold-sea forms seldom extend southward beyond the same 

 province. Hence Kinkwasan Island, that lies ofl' the coast of 

 that province, may be taken as the limit of the two. This 

 satisfactorily answers to what has been proved by Jokdax" from 

 the ichtheological point of view. 



On the Japan »Sea side, the Province of Ugo is the northern 

 limit of the warm-sea forms, while the Province of Oshima seems 

 to be the southern limit of the cold-sea forms. It is not certain 

 whether the western shore of the Province of ^lutsu is occujiied 

 ))y the northern or by the southern species, as that region has 

 not yet been investigated by botanists. The Ojika peninsula in 

 the Province of Ugo may l)e at all events not very far from the 

 boundary of the northern and the southern flora of the .Japan 

 Sea. 



1) JouDAN : tlic Fisli Kiuiiii of Japan. (Science, Vol. XI V., No. uôi. pp. ö4ü-ü(»7. 

 Uct. I'JOl). 



