92 THE BOTANICAL MAGAZINE.- [Vol. xxxi. No. 363. 



The frond ramifies strictly alternately pinnately. Some of 

 the pinnae stop undeveloped, often remaining quite simple and 

 short. Some of them elongate further, decompoundly pinnuli- 

 ferous. In the larger filaments, cells are 2—4 times as long as 

 the diameter, but in the ultimate ramulets nearly as equal. 



J. Agardh remarks that the plant has an appearance be- 

 tween C. gracillimum and C. thuyoides. In Phyc. Brit., both 

 species are given to be provided with the lateral pinnae which 

 are linear in general outline. Kutzing's Tab. Phyc. XII, Taf. 

 1, shows also such aspect. In my specimens, the upper pinnae 

 are in many cases rather fasciculate due to a greater length of 

 the lower pinnules. This, however, is in a too trifle degree to 

 separate the plant from the present species with which it 

 agrees so well in other characters. 



My specimens are tetrasporiferous. A tetrasporangium di- 

 vides at first tetrahedral and then into eight and finally sixteen. 



Locality. Cape Inuboi(I). 



Distribution. Vancouver Island and its vicinity ; Coast of 

 Peru. 



Seirospora ? tenuissima De Toni. 



Syll. Alg. IV, p. 1348. 



(For referrences, see : De Toni, I.e.). 



There are not many species of Seirospora ever recorded. 

 Among them, 5. tenuissima, S. Gailloni and S. Giraudyi are 

 known to have corymbose-fasciculate ramulets, which character 

 is one of the peculiarities in ours. The latter two species, how- 

 ever, are distinguished from ours by having compact cortex in 

 the lower parts of frond. 



Locality. Echigo Prov. (R. Kobayashi, No. 56). 



Distribution. West coast of France ; Gulf of Genoa ; Ad- 

 riatic Sea. 



Ceramium circinatum J. Ag. 



Spec. II, p. 126.— Id. : Epieris, p. 99.— Id. : Flor. Morfol., Tab- 

 Ill, fig. 14-19.— Ardiss. : Phyc. Medit. I, p. Ill,— Hauck : Meeres. 



