EXPLANATIONS AND REFERENCES, 

 PLATE CXXXIX. 



Figures magnified 250 diameters. 



PAGE. 

 Figs. 1, 2. SPIROGYRA BELLJS, compare Plate CXXXVII, figs. 5, 6, . 217 



" 3,4. SPIROGYRA MAXIMA, see var. Plate CXXXVIII. figs. 5, 6, 218 



" 5. 0. two spores germinating, . . .218 



Fig. 7-9. SPIROGYRA CONDENSATA, Var. Rusbyi, . . . 215 



