PLATE XXXIV. 



Figures magnified 375 diameters. 



Page. 

 Figs. 1-8. MiCRASTERiAS ToRREYi, in eight varieties, each represented by 



one-fonrth of a cell. The varieties 



effected by the process of multiplioation 



by division ; two semi-cells of entirely 



different outline being in many cases 



united, as part of the same plant, 118 



