PLATE XLVII. 



Figures magnified 500 diameters. 



Page. 



Fig. 1-3. Staurastkum Wolleanum, Var. Kissimense, . . 163 



Figs. 4, 5. Staurastrtjm Tohopekaligense, front, lateral and end views, 164 



" 6, 7. MiCRASTERIAS PURCATA, Var. SIMPLEX, . . . 122 



" 8, 9. Staurastrtjm parodoxum, Var. Osceoiense, . . 143 



Fig. 10. MiCRASTERIAS VERRUCOSA, ..... 120 



" 11. Sphaerozosma monilifokme, ... 30 



" 12. Sphaerozosma puixjhrum, Var. constrictum, . . 172 



Figs. 13, 14. Bambusina gracilesoens, with zygospores, . . 25 



Fig. 15. MiCRASTERIAS RINGENS, Var. serrulata, . . . 123 



