390 



ERNST 0STRUP 



or species in question is found ; where no figure is added it means, 

 that the genus or species in question has only been found in one 

 sample. 



The following are some of the more conspicuous characterising 

 forms on Rodophyceae: 



Rhabd. arcuat in 12 samples = 9.6 %, Cocconeis and Gramma- 

 tophora each in 11 samples : : 8.9%, Licmophora and Synedra each 

 in 6 samples = 4.8 %>. 



The following are some of the more conspicuous and charac- 

 terising forms on Phaeophyceae: Synedra 10 samples, or 9.3% of 

 the samples, Cocconeis 8 samples or 7.4%, Fragilaria striat. 7 

 samples or 6.5%, Rhabd. arc. 6 samples or 5.6%. 



The following are some of the more conspicuous, characterising 

 forms on the Chlorophyceae: Cocconeis 19 samples or 20.6% of 

 the samples, Fragil. striat. and Synedra each 6 samples or 6.6 %, Lic- 

 mophora and Rhabd. arc. each 5 samples or 5.4 %. 



It appears therefore, that on the Rhodophyceae , Rhabd. arc. 

 and to some extent also Cocconeis and Grammatophora principally 

 are the characterising forms; on the Phaeophyceae the Synedra 



