KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:0 5. 179 
Geogr. Distrib. Found only in the southern part of the Polar Sea on the uorth- 
west coast of Norway. 
Locality: The Norwegian Polar Sea: Nordlanden, scarce. 
Gen. Antithamnion (NAG.) Thun. 
in Le Jol. Liste Alg. Cherb. p. 111; Nae. N. Algensyst. p. 200; char. mut 
Antithamnion floccosum (Mttu.) Kren. 
Nordl. Alg. p. 21. Conferva floceosa Muuu. FI. Dan. t. 828, fig. 1. 
f. atlantica J. G. Ac. 
Descr. Callithamnion floecosum var. @ atlanticum J. G. Ac. Epier. p. 22. 
Fig. » » Harv. Phyc. Brit. t. 81. 
Exsice. » » Howenack. Alg. Mar. N:o 325. 
Syn. Antithamnion floccosum Keen, |. ec. 
Habitat. The present plant has been found in the Polar Sea both litoral, growing 
in rock-pools, and sublitoral, in the lowest part of this zone, being attached here to 
Lithothamnia. On the coasts of Europe only a few sterile individuals have ever 
been found. 
Geogr. Distrib. Known from the Norwegian Polar Sea and, according to J. G. 
Acaxpu, from the sea off Greenland. The northernmost known locality of this species 
is Maasé on the north coast of Norway, about Lat. N. 71°. 
Localities: The Norwegian Polar Sea: Nordlanden, local, very scarce; Finmarken 
exceedingly rare at Maasd. ' 
Baffin Bay: Cp. J. Ac. Epicr. p. 22 in the note under the species in question. 
Antithamnion Pylaiswi (Monr.) nob. 
Callithamnion Pylaiseei Mont. Pl. Cell. N:o 11, sec. J. G. AG. Epiecr. p. 22. 
Descr. Callithamnion Pylaiseei Harv. Ner. Am. 2, p. 239. 
Fig. » » » » » t. 36 B. 
» » » Kutz. Tab. Phyc. 11, t. 90. 
f. norvegica nob. 
Planta minuta, vix semipollicaris, articulis mediis axis primarii et ramorum quam in forma typica bre 
vioribus, diametro vix 4-plo longioribus. Tab. 16, fig. 1. 
Remark on the form norvegica. If one compares the above-quoted figures in 
Harvey and Kirzine with figure 1 in tab. 16 in the present work, representing an 
alga from the north coast of Norway, one cannot well doubt but that the plant called 
C. Pylaiswi exists on the coast of Scandinavia, though in a somewhat different form. 
I have seen the same form also in collections from Greenland. The form from the 
high North differs from the American by its smaller size and by its growing scattered, 
