On the Marine Algae from North-East Greenland. 131 



Fam. Ulvaceœ. 



Enteromorpha (Link.) 



57. E. proliféra (О. F. Müll.) 



к. Rosenvinge (1893) p. <)60 ; 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// in diameter. The membrane of the frond is 11-12// 

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

 number of very young plants were met with. Some of the 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. 



Lo с. Vestre Havnenæs, September. 



Fam. Protococcaceæ. 

 Chlorocliytrium Cohn. 



58. Ch. inclusum Kjellm. 



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

 Very common in Turnerella Pennyi. 



Log. East Side of Ivoldewey Island; Danmarks Havn; о1Г Baadskæret 

 а. 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. 



Lo c. Oli' 13aadskærel and along Vestre Ilavneaies, ca, 28 meters. 



D. Cyanophyceæ. 



Fam. Rwalanaccæ. 

 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 horinogonia. 

 In the littoral zone. 



Loc. Vestre Havnenæs, September. 



