28 



terminal branches have somewhat flabellate arrangement (see fig. 13), 

 while in my plant the apex of branches elongates beyond the pinnulae 

 (fig. 10), In the former, on the other hand, the apex of the branch of 

 every order ends in a single apical cell, while in the latter the 

 terminal portion has longitudinally radiate or flabellate rows of cells 

 (fig. 11.), each row ending in a single apical cell. 



From other species of this genus hitherto known, the present plant 

 differs so much, that I hesitated for some length of time to refer it to 

 this genus ; but tbe structure of frond and character of stichidia can 

 not prevent it from being referred to this genus. 



Harvey mentions a variety of Bytiphlosa complanata var. pusilla, 

 collected at Hakodate, in his Character of New Algaa no. 16 with the 

 following diagnosis : — " fonde nana complanata anguste lineari flabelli- 

 formi subfastigiata pinnatum decomposita pinnis erecto-patentibus 

 crebris plus minus pinnatis, pinnulis subulatis alternis. — An. sp. dis- 

 tincta ? " I did not have an opportunity to see his authenic specimen, but 

 on comparing my specimens (See Fig. 8.) collected in the same locality, 

 I do not find any objection to identify those plants with his variety. 

 From that account, I am in doubt whether his plant may be not a 

 variety of Bytiphlosa complanata, but be my By. angusta. 



From another species described by him, viz. B. latiuscula Harv., 

 which is peculiar to this country, the present plant differs mainly in 

 narrower statue of frond and alternate and not-inrolled pinnulas, while 

 in the former the frond is broader and the branches are opposite. 



{To be continued.) 



