WISCONSIN PR7TOPLANETON 195 



PLATE 10. 



Page 



Fig. 1. Anabaena circinalis var. macrospora (x 400) 60 



Figs. 2-4. Anabaena flos-aquae (Figs. 2-3, x 825; fig. 4, x 400) 60 



Figs. 5-7. Anabaena flos-aquae var. Treleasii (x 825) 60 



Fig. 8. Anabaena Lemmermanni (x 825) 61 



