96 L. KoLDERUP Rosenvinge. 



the examination of the collection that associations of loose-lying algæ 

 occur at several places on soft bottom. In this condition Turnerella 

 Pennyi occurs in particular very abundantly and further Phyllophora 

 Brodiœi * interrupta, Polysiphonia arctica, Delesseria sinuosa, Stictyosiphon 

 tortilis, Ectocarpus littoralis, Chætomorpha Melagonium. On the other 

 hand, Fucus infiatus, which was so abundant among the loose algæ 

 in Scoresby Sound (Comp. К. Rosenvinge 1898, I p. 47, II p. 219) 

 seems to occur more rarely as loose-lying on the bottom in the ex- 

 plored area. Most of the species named continue probably vegeta- 

 ting for a long time in a loose condition. As formerly stated by 

 me (1898 II p. 221), that Polysiphonia arctica is almost always sterile 

 is certainly in connection with the fact that it is not attached to 

 the bottom. 



As to the littoral region, it will be seen from the list that one 

 sample only has been collected above low-water mark; but Mr. 

 LuNDAGER has noled that Fucus inßatus occurs in clefts in the rocks 

 in the lower part of the littoral region at Vestre Havnenæs and at 

 Cape Bismarck. 



Our knowledge of the Marine algæ of East Greenland is due 

 for a great part to collections made during two Danish expeditions 

 in the last decade of the nineteenth century, namely by N. Hartz 

 in 1891—92 (K. RosENviNGE 1898, I) and by С Kruuse in 1898-99 

 (H. JONSSON 1904). According to Jonsson 114 species were known 

 from East Greenland in 1904. One of these species, however, Litho- 

 thamnion varians Foslie, must be omitted, as according to Foslie it 

 must be regarded as a form of Lithothamnion glaciale Kjellm. The 

 total number of species therefore becomes 113. The best investigated 

 part of the coast is that situated between 65° 31' and 70° 27' Lat. N., 

 while only very few species are known from more northern localities. 



In the systematic part of this paper 60 species are recorded 

 (besides two undetermined). 5 of these species are new to Green- 

 land, 3 of them new to science (Cruoriopsis hyperborea sp. п., Punc- 

 taria glacialis sp. п., Myrionema foecumlum (Strömf.) Sauv., Arthro- 

 chœte phœophila sp. п., Pseudendoclonium submarinum Wille). 11 are 

 new to East Greenland (besides the last-named, further Lithotham- 

 nion tophiforme, Chorda tomentosa, Phœostroma pustulosum, Ectocarpus 

 maritimus (= Pilinia maritima (Kjellm.) Rosenv.), Epicladia Flustrœ, 

 Ulothrix scutata). The total number of species known from East 

 Greenland is thus 124 (besides an undescribed species of Choreocolax (?) 

 and perhaps a species of Acrosiphonia)K 



' The total number of species known from Greenland was in 1904, according to 

 JONSSON, 17t), of which 165 were recorded from the west coast. As Lithotham- 



