On the Marine Algæ from North-East Greenland. 131 



Fam. Uluacece. 

 Euteromorpha (Link.) 



57. E. proliféra (O. F. Müll.) 



K. Rosenvinge (1893) p. !)6ü ; Jonsson (1904) p. 66. 



It is with hesitation that I have referred to this species some 

 specimens collected in the littoral region. They are rather much 

 branched, thin, with still thinner branches. The arrangement of 

 the cells in longitudinal series is sometimes tolerably distinct, the 

 new cell-walls being mainly perpendicular to the axis of the frond, 

 sometimes indistinct or wanting. The cells are angular with some- 

 what rounded edges, much as in the typical form of E. intestinalis, 

 but only 7 — 9 ju in diameter. The membrane of the frond is 11 — 12/j 

 thick, the cell-wall is not thickened on the inner side. A great 

 number of very young plants w^ere met with. Some of tlie large 

 plants looked as if they had wintered and later on produced new 

 branches. No "trabeculæ" were observed in the cavity of the frond. 



In view of the great difficulty of determining species of Entero- 

 morpha much stress cannot be laid on the determination of the 

 above-mentioned specimens; nor shall I enter into the question 

 whether E. proliféra is specifically distinct from E. intestinalis. 



Log. Vestre Havneiiics, September. 



Fam. Protococcaceœ. 

 Chlorocliytrium Cohn. 



58. Ch. inclusum Kjellm. 



K. Rosenvinge (1893) p. 963, (1898 I) p. 119; Jonsson (1904) p. 69. 

 Very common in Turnerella Pennyi. 



Loc. East Side of Koldewey Island; Danmarks Havn; olf Baadskæret 

 a. 28 meters. 



59. Ch. Schmitzii K. Rosenv. 



K. Rosenvinge (1893) p. 964, (1898 I) p. 119; Jonsson (1903) p. 338. 



Very common in Cruoria arctica and in Petrocelis polygyna. 

 Loc. Oif Baadskæret and along Vestre Havneaæs, ca. 28 meters. 



D. Cyanophyceæ. 



Fam. RiuLilariaceœ. 

 Calothrix Ag. 

 60. C. scopulorum (Web. et Mohr) Ag. 



K. Rosenvinge (1893) p. 966, (1898 I) p. 121; Jonsson (1904) p. 70. 

 Well developed filaments, in a great measure with hormogonia. 

 In the littoral zone. 



Loc. Vestre Havncnæs, September. 



