KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. n:o 5. 44 
have only lately been distinguished as separate species, and it is thus certainly possible 
that some one or other of them, attention being now drawn to it, may prove to go 
southward of the limit established for the Arctic See. But on the other hand, the 
great majority consists of species so well marked by size and specific characters, that 
it seems rather improbable, if they did occur farther to the south, that they would 
have escaped observation on the coasts comparatively so accurately and long investigated 
of the northern Atlantic, where in such a case most of them would be expected to 
erow. About one third of them belong exclusively to those parts of the Arctic Sea 
which are not filled with ice: the Norwegian Polar Sea, the western Murman and the 
White Seas, namely: 
Lithothamnion soriferum, Monostroma undulatum, 
» alcicorne, » cylindraceum, 
» intermedium, » ~ gaccodeum, 
Polysiphonia Schiibelerii, » angicava, 
Halosaccion saccatum, » arcticum, 
Diploderma amplissimum, » crispatum, 
Lithoderma lignicola, Ulothrix Sphacelarie, 
Ectocarpus Lebelii, Chetomorpha septemtrionalis, 
Pylaiella nana, Chlorangium marinum, 
Gleothamnion palmelloides, Gleocapsa spec. 
Cheetophora pellicula, 
Accordingly 21 species, representing 11 families and 14 genera. The other 42 species 
occur all of them in the Arctic Sea proper. Only 11 or 10 of these have been as yet 
met with also in the Norwegian Polar Sea, in the western Murman Sea, and in the 
White Sea. These are: ? 
Lithothamnion glaciale, Sphacelaria arctica, 
» flavescens, Pylaiella varia, 
Kallymenia septemtrionalis, Ulva crassa, 
Porphyra abyssicola, Monostroma lubricum, 
Alaria membranacea, Codiolum Nordenskiéldianum. 
»  grandifolia? 
Thus there remain no less than 31 or 32 species that are endemic in the Arctic 
Sea proper, namely: ; 
Lithothamnion foecundum, Rhodochorton spinulosum, 
» compactum, » intermedium, 
Lithophyllum arcticum, » spetsbergense, 
Delesseria rostrata, Diploderma miniatum, 
> corymbosa, Scaphospora arctica, 
Hemescharia polygyna, Alaria grandifolia? 
Kallymenia Pennyi, »  dolichorhachis, 
» rosacea, » elliptica, 
Phyllophora interrupta, » oblonga, 
K. Vet. Akad. Handl. Bd 20. No 5. 
