PLATE II. 



Figures magnified ."MO diameters. 



PAGE. 



Figs. 1, 2. DESMIDIUM SWARTZII. Two forms; filaments in vegetative con- 

 dition, . . . . .26 



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



cells forced 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 BAII..EYI. (Aptogonum Batieyi-) 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 



Fig. 10. " " the fully developed spores, . . 27 



"11. " spores matured and separating from the 



filaments, . . . . .27 



" 12. " " end view of filament, . . 27 



" 13. DESMIDIUM QUADRANGULATUM ; part of a filament, . . 27 



" 14. " " end view of filament, 27 



