PLATE II. 



Figures magnified 500 diameters. 



Page. 

 Figs. 1, '2. Desmidium .'^wartzii. Two forms; filaments in vegetative con- 

 dition, . . . . .26 

 Fig. 3. " ' Filament in fruit ; the spores, and empty 



cells forred apart by the growth of the 

 spore, . . . . .26 



Figs. 4, 5. " " End view of cells, showing the triangular 



form of the filaments, . . 26 



Fig. 6. Desmidium Aptogonium, a vegetative filament, . . 27 



" 7. " " the triangular end view of the same, . 27 



Figs. 8, 9. Desmidium Baileyi. (Aptogonum Baileyi.) 8. the normal 



vegetative condition of the chlorophyl ; 

 9. the same concentrating for the forma- 

 tion of the spores, (left hand figure is an 

 end view), ... 27 



" " the fully developed spores, . . 27 



" " spores matured and separating from the 



filaments, . . . . .27 



" " end view of filament, . . 27 



Desmidium quadbanqulatum ; part of a filament, . . 27 



" " end view of filament, . 27 



