204 WISCONSIN PHYTOPLANKTON 



PLATE 19. 



Page 



Fig. 1. Eudorina elegans (x 500) 96 



Fig. 2. Gloeocystis gigas (x 1000) 101 



Figs. 3-4. Sphaerocystis Schroeteri (x 1000) 101 



Figs. 5-6. Tetraspora lacustris (x 500) 102 



