EXPLANATIONS AND REFERENCES, 

 PLATE LXXXI. 



Figures magnified 250 diameters. 



PAGE. 



Fig. 1-3. OEDOGONIUM AUTUMNALE, section of filaments, . 73 



Figs. 4. 5. first stages of development from 



zoospores, . . .73 



" 6, 7. OEDOGONIUM OBSOLETUM, compare Plate LXXIV, tig. 3, . 71 



Fig. 8-11. OEDOGONIUM LANDSBOROUGHII, . 91 



Figs. 12, 13. OEDOGONIUM DELICATULUM, . . 93 



" 14, 15. OEDOGONIUM MONILIFORME, . . . ( .3 



" 16, 17. OEDOGONIUM RUFESCENS, . . 89 



" 18, 19. OEDOGONIUM HEXAGONUM, . . 94 



Fig. 120-22. OEDOGONIUM CYATHIGERUM, 77 



