62 KJELLMAN, THE ALGiE OF THE AECTIC SEA. 



Proviiices of the arctic marine Flora. 



I have attempted in the preceding pages to support the opinion that a strong 

 change of the Flora has taken place on the north-west and north coasts of Norway, 

 so that it has assunied here a character different froin its previous one and from that 

 of the present Flora in the Arctic Sea properly so called. I ain now going to treat 

 this subject more in detail, and to show forth on the ground of the investigations made 

 hitherto, in what degree the Flora on this coast of Norway differs from the Flora 

 of other parts of the Arctic Sea. 



The family types are almost altogether the same. Only three families that are 

 represented on the coast of Norway, want representatives in other parts of the Arctic 

 Sea, namely, Champiacece, Aglaozoniacece, and Derbesiacece. The number of genera pe- 

 culiar to the Norwegian arctic mai'ine Flora is greater, namely, 21(19). These are: 



Spermothamnion, Stilophora, 



Petrocelis, Castagnea, 



Plocamium, Leathesia, 



Chylocladia, Coilonema, 



Chondrus, Lithosiphon? 



Microcladia, Aglaozonia, 



Callithamnion, Myriotrichia, 



Bangia? Prasiola, 



Erythrotrichia, Derbesia, 



Himanthalia, Lyngbya. 

 Halidrys, 



Of the species hitherto known in the Norwegian Polar Sea, the following are 

 not known with certainty from any other part of the Polar Sea: 



Lithothamnion soriferum, Polysiphonia Schilbelerii, 

 » Ungeri, » byssoides, 



» alcicorne, Spermothamnion Turneri, 



» norvegicum, Chantransia Daviesii, 



» intermedium, » virgatula, 



Melobesia membranacea, Delesseria angustissima, 



» macrocarpa, » alata, 



Polysiphonia parasitica, Petrocelis cruenta, 



» Brodiaäi, » Middendorffi, 



» 



fibrillosa, Plocamium coccineum, 



