Ö4 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



Lithothamiiion compacturn, Laminaria fissilis, 

 Delesseria Bjerii, » nigripes, 



Rhodymenia pertusa, Scytosiphon attenuatus, 



Sarcophyllis arctica, Phloeospora puinila, 



Kallymenia rosacea, Dictyosiphon coryinbosus, 

 Pliyllophora interrupta, » hispidus, 



Rhodochorton intermedium, Chaetophora maritima, 



» spetsbergense, Enteromorpha minima, 



Diploderma miniatum, Monostroma lubricum, 

 Fucus evanescens, » leptodermum, 



Scaphospora arctica, Rhizoclonium pachydermum, 



Haplospora globosa, Ulothrix discifera, 



Phyllaria lorea, Characium marinum, 



Laminaria solidungula, Chlorochytrium inclusum. 

 » Agardhii, 



Florideje 9 species representing 7 families, 8 genera, 



Fucoidege 12 » » 5 » 8 » 



Chlorophyllophyceas... 8 » » 4 » 7 » 



Total Sum 29 species representing 16 families, 23 genera. 



One family, Tilopteridece, 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 löst 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 Avithin 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 algse 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 

 iramiorated only into the Norwegian Polar Sea, not those which have probably irami- 

 grated not only here, but also into the other parts of the Arctic Sea. Amongst these 

 there are surely to be numbered several alga3 that are met with in the western part 



