— 171 — 



long, I measured bristles 36-9 p> long. Their thickness was very 

 inconsiderable, not 0-2^. 



I have found this species with bristles in two ponds in North 

 Sealand and two in Jutland. 



Scenedesmus acuminatus (Lagh.) Ghod. Fig. 6 [Lagerheim 1882 

 pag. 71] [Ghodat 1902 pag. 211]. 

 As the preceding species this has 

 only bristles on the points of the 

 cells, and as usual the deep co- 

 loured knob sits at their apex. 

 The eight-celled coenobia may 

 have bristles on all 16 cell points. 

 The bristles are very thin not 

 0-2 yi ; their length I have found 

 to be up to 16^. 



I have found them in three 

 places in North Sealand and one 

 in Jutland. 



Scenedesmus denticulatus Lagh. [Lagerheim 



Fig. 6. Scenedesmus acuminatus (Lagh.) Chod. 

 Löfflers method. (X 730.) 



pag. 61]. This 



Fig. 7. Pediaslrum simplex Meyen f. clathratum Chod. Seibert Obj. V. Oc. I, Löfflers method, (x 380/ 



