PLATE XLVII. 



Figures magnified 500 diameters. 



PAGE. 



Fig. 1-3. STAURASTRUM WOLLEANUM, Var. KISSIMENSE, . . 163 



Figs. 4, 5. STAURASTRUM TOHOPEKALIGENSE, front, lateral and end views, 164 



" 6, 7. MlCRASTERIAS FURCATA, Var. SIMPLEX, . . . 122 



" 8, 9. STAURASTRUM PARODOXUM, Var. OSCEOLENSE, . . 143 



Fig. 10. MlCRASTERIAS VERRUCOSA, . . . . 120 



" 11. SPHAEROZOSMA MONILIFORME, ... 30 



" 12. SPHAEROZOSMA PULCHRUM, Var. CONSTRICTUM, . . 172 



Figs. 13, 14. BAMBUSINA GRACILESCENS, with zygospores, . . 26 



Fig. 15. MlCRASTERIAS RINGENS, Var. SERRULATA, . . . 123 



