EXPLANATIONS AND REFERENCES, 



PLATE CXXXIV. 



Figures magnified 250 diameters. 



PAGE. 



FigS. 1. 2. SPIROGYRA MIRABILE, . . . . . .211 



" 3, 4. SPIROGYRA FLAVESCENS, . . . . .211 



Fig. 5-7. SPIROGYRA GRACILIS, . . . .. . .211 



" 8-13. SPIROGYRA VARIANS, . . . . .212 



" 14-17. SPIROGYRA QUININA, ...... 213 



