PLATE XXXII. 



Figureti magnified 375 diameters 



Pagb. 



Fig. 1. MlCRASTERIAS PSEUDOTORREYI, .... ' ' ,v 



" 2. MlCBASTERIAS AMERICANA, . . . . .112 



" :;. " " Var. recta, . . 112 



" 4. " ' transverse view. . 112 



;,. " - Var. Hermanniana, . . . 112 



Figs. 6, 7. Micrasterias brai HYPTi ra, two semicells varying somewhat in 



details, .... 11<> 



' 8,9. Mjcrastebias papillifera, two forms, . . 109 



