64 . KJELLMAN, THE ALG OF THE ARCTIC SEA. 
Lithothamnion compactum, Laminaria fissilis, 
Delesseria Bveerii, » nigripes, 
Rhodymenia pertusa, Scytosiphon attenuatus, 
Sarcophyllis arctica, Phloeospora pumila, 
Kallymenia rosacea, Dictyosiphon corymbosus, 
Phyllophora interrupta, » hispidus, 
Rhodochorton intermedium, Chetophora maritima, 
» spetsbergense, Enteromorpha minima, 
Diploderma miniatum, Monostroma lubricum, 
Fucus evanescens, D leptodermum, 
Scaphospora arctica, Rhizoclonium pachydermum, 
Haplospora globosa, Ulothrix discifera, 
Phyllaria lorea, Characium marinum, 
Laminaria solidungula, Chlorochytrium inclusum. 
» Agardhii, 
Floridea =e 9 species representing 7 families, 8 genera, 
Rucoidems 2 12." » » 5 D Cohea eP) 
Chlorophyllophyceew.. 8  » » 4 » a” 
Total Sum 29 species representing 16 families, 23 genera. 
One family, Tilopteridew, four genera, Scaphospora, Haplospora, Characium, and 
Chlorochytrium, have no representatives on the arctic coast of Norway. 
If we presuppose that the Flora on the coast of Norway did once possess the 
same composition as that which exists now in the sea on the coasts of Spitzbergen 
and Novaya Zemlya, and that it has afterwards, in consequence of altered external 
conditions, assumed its present character, the change suffered by it, according to the 
figures set forth above, would consist in its having lost 1 family, 4 genera, 29 species, 
receiving in compensation as new elements 3 families, from 19 to 21 genera, 81 species: 
However, it would surely be precipitate to form such a conclusion. In the first place, 
we have no right to presuppose that the Flora on the coast of Norway should have 
been so similar in all particulars to that of the Greenland and the Murman Seas, that 
some species or other could not have been found within the latter regions, though it 
did not exist within the former. Then it is quite possible that some of those species 
which belong to the Flora of Spitzbergen and Novaya Zemlya may really occur on 
the coast of Norway, although they have not as yet been observed. Moreover, it is 
highly probable, that there are old glacial species even amongst those alge which are 
known in the Arctic Sea only from the north and north-west coast of Norway. In all 
probability, Petrocelis Middendorffi is such a species. But, above all, the increase in new 
species has most certainly been very much greater than that indicated by the figure 
of 81. For this figure comprehends only those species which are supposed to have 
immigrated only into the Norwegian Polar Sea, not those which have probably immi- 
grated not only here, but also into the other parts of the Arctic Sea. Amongst these 
there are surely to be numbered several alge that are met with in the western part 
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