322" KJELLMAN, THE ALG OF THE ARCTIC SBA. 
Localities: The Norwegian Polar Sea: Nordlanden according to specimens in KigEy’s 
herbarium; Finmarken at Talvik, local, but rather abundant. 
Baffin Bay: The west coast of Greenland at Tessarmiut, Ameralik, and Pikitsok, 
according to specimens in the herbarium of the Copenhagen Museum. 
Rivularia, Microscopica Dickie. 
Alg. Sutherl. 2; p. 193: 
Deser. Rivularia microscopica Dick1n, |. ec. 
Habitat. Found growing on Enteromorpha compressa. 
Locality: The American Arctic Sea: Assistance Bay, »and other localities», accor- 
ding to Dicxm, 1. ec. 
Gen. Calothrix (Ac.) Tuur. 
Nostoch. p. 5; Ac. Syst. Alg. p. XXIV; char. mut. 
Calothrix Harveyi nob. 
Descr. et Fig. Calothrix fasciculata Harv. Phye. Brit. t. 58, A. 
Remark on this species. 1 share the opinion of ArgEscuoue, pronounced in Phye. 
Scand. (p. 439), that Acarpu’s C. scopulorum and C. fasciculata are forms (or develop- 
ments) of the same species, C. scopulorum Werx. et Monr. C. fasciculata Harv. is no 
doubt specifically distinct from this. I have found the last-named alga at Finmarken, 
and I propose for it the name of C. Harveyi. Harvey's description of it is satisfac- 
tory. Only it should be observed that C. Harveyi is sometimes almost simple, some- 
times richly branched, just as there is to be found of C. scopulorum Wes. et Monr one 
form that is luxuriant and branching and another that is less luxuriant and only little 
branching. 
Habitat. This alga forms dense mats several feet in extent on mouldering wood- 
work at high-water mark. In the Polar Sea it has been found only in sheltered lo- 
calities. When I collected it in the beginning of September, the hormogonia were in 
development. 
Locality: The Norwegian Polar Sea: Finmarken at Talvik, local, but abundant. 
Calothrix Scopulorum (Wes. et Mour) Ac. 
Syst. Alg. p. 70. Conferva scopulorum Wes. et Monr, Reise, p. 190. 
Descr. Calothrix scopulorum Arescu. Phye. Scand. p. 4388. 
» » » Alg. Seand. exsice. N:o 139. 
Syn. Schizosiphon scopulorum Kyntum. Spetsb. Thall. 2, p. 58. Algenv. Murm. Meer. p. 57. 
Habitat. The present species in the Polar Sea forms, in conjunction with seve- 
ral other alge, Rhodochorton Roth, Chetophora maritima, Urospora penicilliformis, spe- 
cies of Codiolum a. o., a thin stratum over stones within the upper part of the litoral 
