PLATE XLV. 



Figures magnified 375^500 diameters. 



Page. 



Figs. ],2. MiCRASTERIAS SPECIOSA, . .119 



Fig. 3. MiCRASTEBIAS APICULATA, . 124 



Figs. 4, 5. MicBASTEKiAs Crux Mblitbnsis, 123 



Fig. 6. MiCRASTERIAS RABENHORSTri, Var., . 131 



Figs. 7, 8. Cylindrocystis TDMiDnia, . . 38 



Fig. 9. Xanthidium fascicdlatum, Var. Subalpinum, 101 



Figs. 10, 11. Xanthidium Coldmbianum, . 100 



Fig. 12. Cylindrocystis De Bakyi, . 58 



Figs. 13, 14. Xanthidium Torreyi. (See Fresh-Water .\lgae. p. 35), — 



