EXPLANATIONS AND REFERENCES, 

 PLATE CCVII. 



Figures magnified 250 diameters. 



PAGE. 

 Fig. 1-3. OSCILLARIA CRUENTA, parts of ordinary filaments, . . 312 



" 4-7 " young, coiled filaments, . . 312 



" 8. OSCILLARIA BREVIS, ...... 312 



Figs. 9, 10. OSCILLARIA FROELICHII, ..... 315 



" 11, 12. OSCILLARIA MAJOR, ...... 316 



" 13, 15. OSCILLARIA GRATELOUPII, ..... 316 



" 16, 17. OSCILLARIA BONNEMAISONII, ..... 316 



" 18, 19. OSCILLARIA LITTORALIS, ..... 317 



" 20, 22. OSCILLARIA PRINCEPS, .... . 317 



