78 KJELLMAN, THE AhGJE OF THE ARCTIC SEA. 



Amongst the species common to all the provinces of the arctic Plora, those of 

 which the iiarnes are printed in italics in the list are amongst its commonest and most 

 abundant ones. Besides, the following species are both common and more or less 

 abundant in the whole province of Spitzbergen or in the greatest part of it. 

 Lithothamnion glaciale, Desmarestia aculeata, 



Rhodymenia palmata, Dichloria viridis, 



Ptilota pectinata, Phloeospora tortilis, 



» plumosa, Pylaiella litoralis, 



Rhodochorton Rothii, Enteromorpha compressa, 



Alaria grandifolia, Rhizoclonium riparium, 



Laminaria Agardhii, Chsetomorpha melagonium, 



» digitata, Urospora penicilliformis. 



» nigripes, 



The following species I believe may be regarded as abundant within more limited 

 areas of the same province: 

 in the White Sea ^): 

 Lithophyllum Lenormandi, Ozothallia nodosa, 



Polysiphonia nigrescens, Fucus serratus, 



Chantransia efflorescens, Alaria membranacea; 



Ahnfeltia plicata, 



in the White Sea and the western Murman Sea ^) : 

 Delesseria Baärii and Rhodophyllis dichotoma; 



in the easterji Murman Sea: 

 Phyllophora Brodiasi and Dictyosiphon corymbosus; 



m the Greenland Sea: 



Elachista hibrica and Rhizoclonium rigidum. 



The following species are especially characteristic of the Siberian province: 



Alaria dolichorhachis, Alaria ovata, 



» elliptica, Laminaria cuneifolia. 

 Within the American province the following species may be regarded as the most 

 abundant ones: 



Lithothamnion glaciale, Fucus filiformis, 



» polymorphum, Agarura Turneri, 



Polysiphonia urceolata, Laminaria longici"uris, 



Rhodophyllis dichotoma, » atrofulva, 



Rhodymenia pertusa, » cuneifolia. 



» palmata, Chorda iilum, 



Ptilota pectinata, Desmarestia aculeata, 



» plumosa, Dichloria viridis, 



Diploderma miniatum, Dictyosiphon foeniculaceus, 



Fucus vesiculosus, Enteromorpha compressa, 



') See GoBi, Algeufl. vveiss. Mc;er. j3. 11. 



