Contribution. I. 175 



Plate 3. 



JJlothrix flacca. 

 Fig. 1. Part of a vegetative thread with very short cells 

 in longitudinal direction of the frond. 230 /i- 

 c 2 — 3. Parts of a zoospore-bearing thread. a30 /i. 



Urococcus Foslieanus. 

 Tig. 4—5. Two cells with annulated, gelatinous stalk. 600 /!. 

 « 6. A cell which has divided itself into two daughter- 

 cells; 7i. small drops of Hamatochrom. 600 /i. 



Dactylococcus (?) liloralis. 

 Fig. 7. A vegetative cell before, during and after the di- 

 vision. 900 /i- 



Dadylococcus marinus. 

 Fig. 8. Vegetative cells of the plant. 600 /i. 



Pleurococcus marinus f. typica. 

 Fig. 9. A young cell, then a three- and a four-celled fami- 



ly. 6 °%. 



Pleurococcus marinus f. major. 

 Fig. 10. A vegetative cell of the plant. 60 %. 



Protococcus marinus f. Foslieana. 

 Fig. 11. A vegetative cell of the plant. 600 /i. 



Protococcus ovalis. 

 Fig. 12. Vegetative cells of the plant. 600 /!. 



Polycystis litoralis. 

 Fig. 13. Two families of the plant. 60 %. 



Sarcina litoralis (?) f. norvegica. 

 Fig. 14. A tuberous family of the plant. 600 / 1 . 



