Microplankton Innu the Finnish Waters during the Month of May H>t: J . 



2] 



Synedra affinis Kürz. 



(Fig. 18 b.) 



V. H. S. p. 15)5, pl. 41, f. 13. 

 1910 Meunier, p. 310, pl. 32, f. 54. 



Saline and brackish water. 



Synedra pulchella Kitz. 



(Fig. 18 a.) 



V. H. 8. p. 149, pl. 40, f. 28-29. 

 1910 Meunier, p. 311, pl. 32, f. 53. 



Brackish and fresh water. 



Fig. 18. 



1000 



i 



a. Synedra pulchella. 

 h. „ affinis. 



c. „ radians. 



d. Rhabflaiicma arcuatum. 



voit tf."i ,, ii°.''»»i D !r^ 



Synedra radians ( Kitz.) Grün. 



(Fig. 18 c.) 



V. H. S. p. 151, pl. 39, f. 11. 

 Fresh water. 



In addition some single cells were found, whicu could not be deterniined being very 

 indistinct or lying in an awkward position in the préparation. 



N:o 5. 



