12 



AKT. iL'. K. V1;NI)(>. 



species anywhere within our boundaries. There is no reason, 

 however, to deny the occurrence of a Cystoseira species on the 

 coast of that province. I actually collected Marchesettia spongi- 

 oldes and Vanvoorstia speciabilis, which occur in Loochoo and 

 are undoubtedly tropical, some years ago in the southern j^art of 

 the Province of Kii but at no place farther north. There will 

 be no great error in taking Cystoseira as a representative, in 

 Japan, of the alga.' of the subtropical waters ; in other words, 

 of the region from the southern end of the Kiushiu Islands to 

 Formosa. The species of Sargassuin under the series Acanlho-' 

 earpiece J. Ac;, fiourisli mainly Avithin this region. 



G. The Pacific and the Japan Sea side have many species 

 in common. Both sides, however, differ more or less in having 

 several species peculiar to one or the otiier of them. Thus : — 



Peculiar to the Pacific side. 



Sargassiuib selacciun. 



/S. pinnat'ifidum. 



S. tosœnse. 



S. kash I wajinian u in . 



S. kushimolense. 



tS. Ilici folium rar. dupHcaluiii. 



S. crista foli'i///. 



/V. graiiiinijubain. 



S. sagamianum. 



S. iilj>po/iicum. 



( )n Ijoth sides iiic. dillrrcncu 

 most remarkable in mi(hllc .Ja})aii, 

 ill ihe southern seas as well ;i.s in 



Peculiar to the Japan Sea side. 



Sargassum fuloellum . 

 S. confiisum. 

 S. confusum f. vaiidiun. 

 aV. Thunbergii f. iiipjmnlca. 

 S. 3Iiyabei. 



Cystophylhim cœspitosum . 

 Coccophoi'a La ngsdorfil. 

 0. Iin2)crata. 



of tlie distribulive features is 

 bc(5oming graihially indistinct 

 liukkaido. 



