EXPLANATIONS AND REFERENCES, 



PLATE CXLL 



Figures magnified 250 diameters. 



Figs. 1, 2. SPIROGYRA SUB^QUA, 



" 3, 4. SPIROGYRA SUBSAL.SA, 



Fig. 5-7. SPIROGYRA PUNCTATA, 



" 8-10. SlROGONIUM STICTICUM, 



PAGE. 



. 217 



212 



. 215 

 222 



