I'LATK XXXIV. 



Figures magnified :i7.~> diameters. 



PAOE. 

 Figs. 1-8. MICKASTERIAS TORREYI, in eight varieties, each represented by 



one-fourth of a cell. The varieties 

 effected by the process of multiplication 

 by division ; two semi-cells of entirely 

 different outline being in many cases 

 united, as part of the same plant, . 118 



