192 WISCONSIN PH7TOPLANKTON 



PLATE 7. 



Page 



Fig. 1. Spirulina major (x 1000) 50 



Fig. 2. Spirulina princeps (x 1000 ) 50 



Figs. 3-5. Oscillatoria prolifica (x 825) 51 



Fig. 6. Oscillatoria tennis (x 825) 52 



Figs. 7-8. Oscillatoria tennis var. tergestina (x 825) 52 



Figs. 9-11. Lyngbya limnetica (x 1000) 52 



Figs. 12-13. Lyngbya contorta (x 1000) 53 



Figs. 14-15. Lyngbya Birgei (x 825) 54 



