WISCONSIN PHYTOPLANKTON 



PLATE 23. 



Page 



Figs. 1-2. Oocystis eremosphaeria (x 1000) 113 



Fig. 3. Oocystis panduriformis var. minor (x 1000) 114 



Figs. 4-5. Oocystis natans var. major (Fig. 4, x 500; fig. 5, x 1000).. 114 



Figs. 6-7. Nephrocytium Agardhianum (x 1000) 114 



Figs. 8-9. Gloeotaenium, Loitles'bergerianum (x 400) 115 



Figs. 10-13. Tetraedron muticum var. punctulatum (x 1000) 116 



Figs. 14-16. Tetraedron trigonum (x 1000) 116 



