164 KJELLMAN, THE ALG OF THE ARCTIC SEA. 
in general characteristically different from each other, it is more fit, I think, to treat 
them as different species than as forms of the same species. 
Habitat. This alga in the Arctic Sea is sublitoral, sometimes elitoral, usually 
occurring among the formation of Laminariacew. It grows in general scattered, some- 
times somewhat gregarious, attached to small stones and shells. Although preferring 
exposed coasts it does not limit itself exclusively to such localities. I have found it 
with young nemathecia at Finmarken in August, on the west coast of Waygats at the 
end of July. 
Geogr. Distrib. According to my experience, this species has its maximum of 
frequency in the most south-eastern part of the Murman Sea. It is rare in the Atlantic 
region of the Polar Sea. Its northernmost known locality is on the north-west coast 
of Spitzbergen, Lat. N. 79° 45’. 
Localities: The Norwegian Polav Sea: Finmarken: Gjesver, Oxfjord, Talvik, local 
and scarce. 
The Greenland Sea: the north-west coast of Spitzbergen, rare; the east coast of 
Greenland. 
The Murman Sea: the coast of Cisuralian Samoyede-land, Kolgujew Island, the 
west coast of Novaya Zemlya from S. Gusinnoi Cape and the west coast of Waygats, 
at the latter place common and abundant; Jugor Shar. 
The White Sea: at several places. 
The Kara Sea: Uddebay on the east coast of northern Novaya Zemlya; Karabay. 
Phyllophora interrupta (Grev.) J. G. Ac. 
Spetsb. Alg. Progr. p. 3; Spharococcus interruptus Grev. Act. Leop. 14,2, p. 423. 
Descr. Phyllophora interrupta J. G. Ac. Epicr. p. 217. 
» » KsELLM. Spetsb. Thall. 1. p. 21. 
Fig. Spheerococcus interruptus Kiitz. Tab. Phye. 19, t. 20. 
Exsice. Phyllophora interrupta Ksetum. in Argscu. Alg. Seand. exsice. N:o 405. 
Syn. Phyllophora Brodizi Harv. Fl. West-Esk. p. 49. (?) 
» » Wirrr. in Heugl. Reise p. 284; sec. spec. 
» interrupta J. G. Ac. Spetsb. Alg. Progr. p. 3; Bidr. p. 11. 
» » Eaton, List, p. 44. 
» » Gost, Algenfl. Weiss. Meer. p. 41. 
» » KyEeLuM. Vinteralgv. p. 64; Spetsb. Thall. 1, p. 20, Algenv. Murm. Meer. p. 
20; Kariska hafvets Algv. 21. 
Rhodymenia interrupta Asam. Alg. Hayes, p. 96, 
» » Dickie, Alg. Walker, p. 86. 
» » Harv. Ner. Am. 2, p. 149. 
Habitat. A sub- or e-litoral species, growing scattered within the formation of 
Corallinew, Lithoderma, and, not unfrequently, even of Laminariacew, generally on 
exposed coasts, but even in sheltered places. It has been mentioned before, that it is 
sometimes found lying loose on the bottom in great masses, cp. p. 17. On the north 
coast of Spitzbergen it continues to develop all the year round. I found plants in 
