EXPLANATIONS AND REFERENCES, 



PLATE CLXIII. 



Figures magnified 500 diameters. 



PAGE. 

 Fig. 1-5. PROTOCOCCUS VIRIDTS, Vars. glomeratus. dissectus and humicola, 



showing; early stages of development of 

 filaments of Ulothrix, . . (138), 181 



" 6. PROTOOOCCUS INFUSIONUM, .... 182 



"7. A form frequent in pools, ..... 



Figs. 8, 9. ULOTHRIX PARIETINA, developing from Protococcm, . 138 



Figs 10, 11. Early stages of development of Stiyeoclonium from Protococcus, 



compare Plate XCVI, .... 



" 12, 13. NEPHROCYTIUM AGARDHIANUM, . . . .197 



" 14. 15, 17. " " younger forms, . 197 



" 16, 18, 19. NEPHROCYTIUM NAEGEUI, ..... 197 



