EXPLANATIONS AND REFERENCES, 

 PLATE CXLV. 



Figures magnified 300 diameters. 



PAGE. 



Figs. 1, 2. ZYGOGONIUM PECTINATUM, . ... 225 



Fig. 3. ZYGOGONIUM AEQUALE, ..... 22<> 



Figs. 4, 5. ZYGOGONIUM DECUSSATUM, . ... 22(> 



" 6, 7. ZYGOGONIUM AGARDHII, ..... 



Fig. 8. ZYGOGONIUM RALFSIJ, ..... 



" 9. ZYGOGONIUM PARVULUM, ..... 227 



