PLATE XLVIL 



FIGS. PAGE 



1-2. Micrasterias apiculata (Ehrenb.) Menegh. 1, x 



250 (after a drawing by Turner) ; 2, x 170 . 97 



(In fig. 1 we think the size of the teeth on 

 the polar lobe has been somewhat exaggerated 

 by Turner.) 

 3-4. M. apiculata var. fimbriata (Ralfs) Nordst. 3, x 



200 (after Ralfs) ; 4, x 200 (after Nordstedt) 99 

 5. M. apiculata var. fimbriata forma spinosa Bissett. 



x 200 (after Bissett) . . .100 



6. M. apiculata var. brachyptera (Lund.) West & 



a. S. West, x 200 (after Lundell) . 101 



7. M. apiculata var. brachyptera (Lund.) West & 

 G. S. West. A smooth form (forma gldbrius- 

 cula Nordst.) x 200 (after Nordstedt) . 102 



