EXPLANATIONS AND REFERENCEvS, 



PLATE CXXXV. 



Figures magnified 250 diameters. 



PAGE. 



Figs. 1, 2, SPIROGYRA INSIGNIS, Var. elongata, . . . .210 



" o, 4. SPIROGYRA ADNATA, ...... 220 



'' 5, 6. SPIROGYRA DECIMINA, . . . . . .216 



" 7, 8. SPIROGYRA LUTETIANA, ..... 214 



" 9, 10. SPIROGYRA LONGATA, ...... 214 



" 11, 12. SPIROGYRA DUBIA, ...... 220 



