PLATE XI A 



Figures magnified 375-.VK) diameters. 



PAOB. 



FigS. 1,2. MICRASTERIAS SPECIOSA, . . . . .119 



Fig. 3. MlCRASTERIAS APICULATA, . . 124 



Figs. 4, 5. MICRASTERIAS CRUX MELITENSIS, . . . .123 



Fig. 6. MICRASTERIAS RABENHORSTII, Var., . . . 131 



Figs. 7, 8. CYLINDROCYSTIS TUMIDUM, . . . . .38 



Fig. 9. XANTHIDIUM FASCICULATUM, Var. Subalpinum, . 101 



Figs. 10, 11. XANTHIDIUM COLUMBIANUM, . . . 100 



Fig. 12. CYLINDROCYSTIS DE BARYI, .... 58 



Figs. 13, 14. XANTHIDIUM TORREYI. (See Fresh- Water Algae, p. 3o), . 



