EXPLANATIONS AND REFERENCES, 

 PLATE CXL. 



Figures magnified 200 diameters. 



PAGE. 

 Fig. 1-3. SPIROGYRA CBASSA, . . . . . .219 



" 4-7. SPIROGYRA FUSCO-ATRA, . . . . .215 



Figs. 8, 9. SPIROGYRA PARVISPORA, . . . . .221 



