PLATE VIII. 



Fig. 1 Mougeotia genuflexa. 



a, fruiting filament. 



" 2 Zygnema cruciatum. 



" 3 Zygnema pectinatum anomalum. 



" 4 Spirogy ra tenuissinia. 



a, fruiting filament. 

 " 5 Spirogyra grevilleana. 



a, conjugating filaments. 

 " 6 Spirogyra inflata. 



a, fruiting filaments; b, filaments in conjugation. 

 " 7 Spirogyra varians. 



a, filaments in conjugation. 

 " 8 Spirogyra caiospora. 



