EXPLANATIONS AND REFERENCES, 



PLATE CLXV. 



Figures under different magnification. 



PAGE. 



Fig. 1-4. TETRASPORA BULLOSA, thallus about natural size; the cells 



magnified, . . . 190 



Figs. 5, 6. thallus less than natural size, . 190 



" 7,8. TETRASPORA CYLJNDRICA, thallus one-half the natural size; 



cells magnified, . . .190 



Fig. 9. TETRASPORA LUBRICA, about half the natural size, . 191 



Figs. 10, 11. " " Var. lacunosa, half natural size; cells 



magnified, . . . .191 



Fig. 12. TETRASPORA EXPLANATA, . . . . .191 



