PLATE XV. 



Figures magnified 500 diameti rs 



Page. 

 1. ( !obm \imim i; \i.| -11. ...... 69 



j 1. Cobmarium pachydkbmum; 1 1 1 1*- forms, . . .7(1 



I ig. 5. i osm m.'hm DeBaryi, . . . . 58 



Figs. 6 9. Cosmarium i dci mls, four sia .... 58 



Fig. 10. Cobmarium laeve, a variety, . . . . 62 



Fig8. 11, 14. CoSMARJUM P8EUDOPYRAMIDATUM, .... 69 



J-'ij,'. 13. zygospore, and husks of cells, 59 

 11. 15. i obmarium uranatum, Var. elongatum, for typical form Sa 



Plate L, 6g. 13, . . 60 



" 16, 17. CoHMARJOM moniliformis, two forms, . 60 



1 iu r l v - after division, new semicells enlarged, 60 



" lit. zygospore, .... 60 



" 20. Cosmarium globosum ; :i variety; Sa typical form, Plate 



XI. IX. tigs. 1 1 17. . . en 



" 21. ( OSM \ RIUM BKX I 'I. \ I I M. . . . . 60 

 " 22. " - zygospore, . . . .60 



" "J.".. -M \l;ir\l rOMIDUM, . . . . . .til 



