EXPLANATIONS AND REFERENCES, 



PLATE CXVII. 



Figures magnified 125 diameters. 



PAGK. 



Fig. 1-3. ULOTHRIX ZONATA, three vegetative filaments, . . 133 



" 4. Cells of filament with macrozoospores, . . .134 



" 5. Three zoospores, . . . . . . .134 



" 6-9. Zoospores in early stage of development, . . 134 



" 10. Cells of filament with microzoospores . . . .134 



" 11. The same enclosed in cysts, . . . . .134 



" 12. Separated and at rest, . . . . . .134 



Figs. 13, 14. Microzoospores germinating in cells, . . . 134 



" 15, 16. Zygospores, ....... 134 



Fig. 17-19. Microzoospores conjugating two of them fertilized, . 134 



" 20-22. ULOTHRIX YOUNGANUM,. ..... 135 



" 23-25. ULOTHRIX SPECIOSA, . . . . .135 



" 26. Partly empty cells from which the macrozoospores passed out, 135 



