EXPLANATIONS AND REFERENCES, 



PLATE CXXXII. 



Figures magnified 250 diameters. 



PAGE. 



Fig. 1-3. SPIROGYRA TENUISSIMA, ...... 207 



Figs. 4, 5. SPIROGYRA SPREEIANA, ..... 208 



u 6, 7. SPIROGYRA INFLATA, ...... 207 



Fig. 8-10. SPIROGYRA QUADRATA, ..... '208 



" 11. SPIROGYRA WEBERI, ...... 208 



Figs. 12, 13. SPIROGYRA GREVILLEANA, . . . 209 



