IQQ WISCONSIN PHYTOPLANKTON 



PLATE 58. 



Page 



Fig. 1. Cosmarium ovale Ealfs (x 400) 37 



Fig. 2. Cosmocladium saxonicum De Bary (x 400) 38 



Figs. 3-9. Cosmocladium Hitchcockii (WoUe) comb. nov. (Fig. 3, x400; 



4, x 500 ; 5-a, x 1000) 38 



