303 



I have had foiir gatherings of Plankton for examination, viz. 

 from Sorvaagsvaln ncar Bosdalafos; mouth of Sandsvatn ; thc lake 

 in Vaags Ejde; and the lake in Kvalbo Ejde. Asterionella fonuosa 

 is Ihe only Irue form of freshwater-Plankton-Diatom. Here I may 

 remark Ihal species have hccn found in Plankton which do not 

 occiir in thc rest of the malerial, but thcsc occur only as single 

 specimens, e. g. Amphipleiira pelliicida, Cijmalopkiira Solea, Cainpy- 

 lodisciis noricns. 



