PLATE XXXVin. 



Figures magnified 37o diameters. 



Page. 



Figs. 1, 2. MiCRASTERiAS ROTATA, two forms, . . . 120 



Fig. 3. " " Var. simplex, . . 120 



" 4. MiCRASTERiAS DENTicuLATA, circular form, . . . 120 



" 5. " " more oblong in outline, . 120 

 "6. " " larger variety, near M. angulosa 



of Eeinsch, . . 120 



Figs. 7, S. " " semi-cells of two smaller forms, . 120 



