830 ASTRID CLEVE, THE PLANKTON OF SOME LAKES IN SWEDEN. 



Eritosmostracans : 



Daphnia {Cephaloxus) cristata G. 0. Saks. 



Diaptomus graciloides LiLLJEBORG. 



Cyclops scutifer G. 0. Sars. 

 Infusorians: 



Tintinnopsis lacustris Entz. + . 

 Flagellates: 



Dinobryon sertularia Ehe., cc, with silicous spores. 

 Desmids: 



Sphcerozosma sp.^ r. 



Staurastrum sp., r. 

 Diatonis: 



Asterionella formosa v. subtilis Grun., r. 



Tabellaria fenestrata (Lyngb.) KüTZ., r. 

 » ßocculosa (Roth.) Kütz., r. 



7. Sag-^at, Niavve, i^/e 1896. 



This sample was gathered in a very shallow part of the 

 lake, where the tow-net sometiraes touched the bottom. As sorae 

 littoral forms thus have been raixed with the floating ones, I 

 give no list of the species. The plankton resembles that of the 

 preceding gathering and Dinobryon dominates. The Tabellarice 

 are, however, coraparatively more frequent, but occur only in 

 zigzag-bands, not in star-like aggregates. 



8. Saggat, Storholmen, ^Vo 1896- 



Plankton chiefly composed of Dinobryon^ occuring in great 

 abundance. Diatoms scantily represen ted. 

 Entomostracans: 



Bosmina obtnsirostris G. 0. Sars, cf. 9- 



Chydorus sphoericus (0. F. MÜLLER). 



Diaptomus graciloides Lilljeborg. 



Cyclops scutifer G. 0. Sars. 

 Rotatorians: 



Anurea cochlearis GosSE, r. 



