portions of both surfaces taken together. Colour light yellowish 

 brown, turning to black in drying. 



Hab. : On rocks in the depths of 2-6 fathoms. Strait of 

 Hirado (Prov. Hizen), Wajima (Prov. Noto), No (Prov. Yechigo), 

 Avvomori (Mr. Higashi) ; Hanseiho and Zetsuyei-to near Fusan 

 (Chosen). 



When the frond is quite simple, it is difficult to distinguish 

 the present plant from Laminaria. But in the latter, as far as 

 we know, marginal teeth are never present and they may be taken 

 as a characteristic distinguishiug an Ecklonia from Laminaria. As 

 the frond of an Ecklonian plant, as a rule, branches or divides 

 pinnately, the marginal teeth may be considered as rudiments of 

 pinnae when the frond is quite simple, as may be inferred from 

 the homology between marginal teeth of frond and tooth-like be- 

 ginning of pinnae formed on both sides of the growing portion 

 near the base of the frond. 



Again rugae seem to be taken as another characteristic. In 

 Laminarian plants, rugae (considering bullations or network-like 

 wrinkles of the same meaning as rugae) when present are not 

 equally spread over the frond after the manner of an Ecklonia, 

 but usually are arranged, as far as I know, on both sides of the 

 median fascia. {Laminarlia radicosa Kjellm. is, in my opinion, not 

 a Laminaria, but perhaps an Ecklonia or a new genus, on account 

 of the presence of marginal teeth, pinnate lobes and equally scat- 

 tered bullations). 



PL. CXL. Fig. 1 : older frond of Ecklonia stolonifera Okam., 

 -J-.. Fig. 2 : fully grown and not-branched frond, -*-. Fig. 3 : 

 newly grown frond, b, taking the place of the older one, a, of the 

 preceeding year, -*-.- Fig. 4- ; cross-section of stem, -y. Fig. 5 : 



