PLATE XXXIV. 



Figui es magnified 375 dian 



Page. 

 Figs. 1, 2. Micrasterias roxata, two forms, ..... 109 



Fig. 3. ' " Var. rimplex, .... 109 



" I. Micrasterias DEirnctrLATA, circular form, . . . 109 



5. more oblong in outline, . 109 



'* (i. larger variety, near M. angulosa of 



Reinsch, .... 109 

 ;. - aemicells of two smaller forms, 109 



