— U[ — 



1895, p. "271, PI. IV, ligs. 31—33), which has been supposed to be a 



stage of Aphatuzoiiioion flos aqmr (L.) Ralfs., and perhaps it is also the 



case with the form in question; i)ul the cells are larger than those in 

 Klebahn's form. 



CoelosphieriHin >';eg;ellaniiin Unger. This form has been figured by 

 Borge (Schwedisches Siisswasserplanklon, Botaniska Notiser 1900, PI. 1, 

 fig. 5); the cells contain „ floating-bodies" and are arranged in a sphere, 

 the mucilage of which has a radiating structure, especially when treated 

 with methylen-blue. 



Chroococciis liiniieticiis Lemm. is a very characteristic alga. Lem mer- 

 man n has given a good figure of it in Forschungsber. d, biolog. Station 

 zu Plon Vll, 1899, PI. 1. 



Microcystis incerta Lemm. and P. stagnalis Lemm. — I am not ([uite 

 sure of the correctness of the determination of these two species, but the 

 specimens examined agree well with the short descriptions and the figure. 



