Microplankton /nun the Finnish Waters during /In Month of May 1912. 

 Asteriondia formosa Hassal var. gracillima (Hantzsch) Gbun. 



(Fig. 15(1.) 



V. H. S. p. 154, pl. 51, f. 19—24. 

 1908 Gran, p. 119. 



Several cells of this species occurred at station B 1 41. Fresh water. 



O 



o 



Fi«-. 15. 



1000 

 1 



a. Amphiprora decussata? 



b. Cocconeis Placentnla. 



c. Cocroneix Scutellum. 

 iL Asterionella formosa. 



( occoneis Placentnla Ehe. 



(Fig. 15b.) 



V. H. S. p. 133, pl. 30, f, 26—27. 

 Brackish and fresh water. 



Cocconeis Scutellum Ehr. 



(Fig. 15 c.) 



V. H. 8. p. 132, pl. 29, f. 1 — 12 

 Marine. 



N:o 5. 



