PLATE III. 



Figures magnified 500 diameters. 



Page. 

 Fig. 1. Desmididm cyI/INDBICUM, {Didymoprium GreuiUi), part of a 



vegetative filament, . . .25 



" 2. '• " end view of a cell, . . 25 



' 3. " " two cells copulated ; chlorophyllous 



contents pa.5sing through a gelatinous 

 tube, from one cell to the other, . 25 

 '• 4. " " Two developed zygospores ; the two 



empty cells still connected, . 25 



" 5. Mesotaenium Bbaunh, D. By. {Palmoglcea Tiiaerococca, Kg.), 



a group of three vegetative cells, . 32 

 Figs. 6—9. ' " advancing stages of copuljition and 



spore formation to the fully developed 

 zygospore, . . . .32 



Fig 10.' Mesotaenitm MicROCoccUM, a group of seven cells. . 32 



" 11. Mesotaenium Endlichebiandm, a grovip of four cells, . 32 



" 12. Mesotaenium clepsydra, three vegetative cells, . . 32 



Figs. 13-15. " " two cells copulating and two devel- 



oped spires, husks remaining at- 

 tached, . . .33 

 " 16-! 9. SpIROTABNIA OBSOUKA, . 33 

 " 16, 17. " " young stages of development in gela- 

 tinous envelopes, . . 33 

 " 18,19. " " more matured forms, . . 3* 

 Fig. 20. Spibotaknia Bbyophila, {S. museicola), a group of four, . 34 

 Figs. 21, 22. Spirotaenia condensata, . . 33 



