PLATE XXXIII. 



Figures magnified 375 diameters 



Page. 



Fig. 1. MlCRASTEKIAS JEKXERI, . . . 1 1 ", 



2. - - Var. angulosa, . . 115 

 3, 1 MicRASTERiAf oscitans, two aemicells, varying mainly in the 



apices of tli<- polar Lobes; in the one 



simple, in the other divided, . 1 l<i 



5,6. Micrasteria* decemdentata, a large form, two sizes, . 113 



7. 8. MlCRASTERIAS CRENATA, tWO form8, .... 113 



