PLATE X. 



Fig. 1 Spirogyra fluviatilis. 



a, conjugating filaments. 

 2 Spirogyra orbicularis 



a, fruiting filament. 

 3 a Spirogyra majuscula. 



3, vegetative filament. 

 " 4 Spirogyra adnata. 



a, conjugating filaments. 

 5 Spirogyra porticalis. 



a, fruiting filament. 



