EXPLANATIONS AND REFERENCES, 

 PLATE LIX. 



Figures magnified 500 diameters. 



PAGE. 

 Fig. 1-3. STAURASTRUM WOLLEANUM, Var. KISSIMENSE, . . 44 



Figs. 4, 5. STAURASTRUM TOHOPEKALIGENSE, front, lateral and end views, 45 



" 6, 7. MlCRASTERIAS FURCATA, Var. SIMPLEX, . .. . 40 



" 8.9. STAURASTRUM PARADOXUM Var. OSCEOLENSE, . . '45 



Fig. 10 MlCRASTERIAS VERRUCOSA, . . .41 



" 11 SPHAEROZOSMA MONILIFORME, . .22 



" 12. SPHAEROZOSMA PULCHRUM, Var. CONSTRICTUM, . 22 



Figs. 13, 14. BAMBUSINA GRACILESCENS, with zygospores, . 21 



Fig. 15 MlCRASTERIAS RltfGENS, Var SERRULATA, . . .41 



