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MB. E. M. HOLMES ON MARINE ALGX FROM JAPAN. 249 
describing in detail edible and other Japanese Alge; and a 
few Laminarie were added by Kjellman and Petersen * in 1885, 
obtained during the expedition of the * Vega.' 
Nevertheless the whole number of the known species was 
estimated by Hariott in 1891 at only 233 species. Since that 
date a few species have been added by F. Schmitz and Reinbold 
in Germany, and Okamura and Yatabe in Japan, and De Toni 
in Italy. 
The parts of the Japanese coasts that have been hitherto 
explored are chiefly in the neighbourhood of Hakodadi in the 
northern island of Yesso, Tokio in the middle island of Nippon, 
and Nagasaki in the southern island of Liu-kiu, the northern 
coast not having been worked at all. As out of 150 species sent 
to me from the neighbourhood of Tokio last year, about 30 have 
proved to be new, it may be inferred that the coasts of Japan, if 
thoroughly explored, would yield a rich harvest to algologists. 
Although the latitude in which North Japan lies is nearly parallel 
with that of Great Britain, a considerable portion extends much 
farther south ; and it is interesting to find that about one twelfth 
of the known British species occur in that country, including 
2 Cyanophycee, 9 Chlorophycee, 13 Pheophycee, and 25 Rhodo- 
phycee ; a list of which is given in the form of an Appendix at 
the end of this paper. 
During the last few years Japanese seaweeds have been 
forwarded to several European algologists, including Kjellman 
in Sweden, Hariot in France, De Toni in Italy, and Schmitz and 
Reinbold in Germany ; so that a large accession to the number 
of known Japanese Algæ may shortly be expected. 
The present list of new Japanese Algz includes only those which 
I have been able to refer to their genera, since a number of others 
cannot be determined in the absence of fructification, even the 
genera to which. they belong being uncertain. Ofthe 23 new 
species herein described, 4 belong to the Chlorophycee, 3 to the 
Pheophycee, and 16 to the Rhodophycee. 
CHLOROPHYCEZ. 
CLADOPHORA OHKUBOANA, n. sp. (Pl. X. fig. 1); fronde 
corneo-cartilagineá, saturate viridi, ad 3-4 pollices longa, crebre 
ramosá, ramis erectis acutis di-trichotomis, ramulorum cellulis 
* Kjellman och Petersen, ' Om Japans Laminariaceen, 1885. 
+ Hariot in Mém. des Sc. nat. et math. de Cherbourg, 1891, pp. 211-220. 
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