EXPLANATIONS AND REFERENCES, 



PLATE CXLII. 



Figures magnified 250 diameters. 



PAGE. 

 Figs. 1, 2. SPIROGYBA COMMUNIS, . . . . . .213 



" 3, 4. SPIROGYRA JUERGENSII, ..... 213 



" 5, 6. SPIROGYRA MAJUSCULA, conjugated with S. ealospora, . . 221 



<l 7, 8. SPIROGYRA, rootlets, S. quad.rata, .... 208 



" 9,10. SPIROGYRA, stellate nuclei, see figs. 8, 9, . . . 210 



