PLATE VIII. 



Figures magnified 250 diameters. 



PAGE. 

 Fig. 1. CLOSTERIOM DECORUM, . .... 45 



" 2. CLOSTERIUM SUBTILE, ..... 42 



" 3. CLOSTERIUM AREOLATUM, . . . . .46 



" 4. end, more highly magnified, . 46 



" 5. CLOSTERIUM JENNERI, .... .47 



" 6. CLOSTERIUM VENUS, (a group of three), ... 47 



" 7. CLOSTERIUM PARVULUM, (a group of three), . . .47 



Figs. 8, 9. CLOSTERIUM DIANAE, Var. arcuatum, and typical form, . 47 



Fig. 10. CLOSTERIUM RALFSII, one half-cell vegetative state, the other 



half lifeless, . .49 



Figs. 11, 12. CLOSTERIUM ACUTUM, and zygospore, . . 46 



" 13, 14. GLOSTERIUM LEIBLEINII, . . ... . .49 



Fig. 15. CLOSTERIUM MONILIFERUM, ..... 48 

 " 16. CLOSTERIUM EHRENBEROII, . . . . .48 



" 17. " " Var. immane, . . 48 



" 18. CLOSTERIUM ACUMINATUM, smaller form, . . .47 



" 19. longer form, empty cells attached to 



zygospore, . . . .47 



" 20. CLOSTERIUM LEIBLEINII, zygospore, with empty membrane of 



the copulated cells, . . .49 



