EXPLANATIONS AND REFERENCES, 



PLATE CXCIV. 



Figures magnified 250 diameters. 



PAGE. 

 Fig. 1-3. SIROSIPHON OCELLATUS, three sections of branching filaments, 272 



" 4. Part of a broken filament, . . . . .272 



Fi^s. 5, 6. Cells passing out and developing into larger forms, . . 272 



Fig. 7-10. Young plants developing from the last, . . .272 



" 11-16. SIROSIPHON CRAMERI. from specimens from New Jersey 



answering the descriptions, but suspect, 

 it may be merely a form S. ocellatus, 272 



" 17-20. SIROSIPHON BRANDEGEEI, older and younger forms, . 274 



" 21. Sporaugial cells, ..:.... 274 

 Figs. 22, 23. Gloeocapsa cells developed from the last condition, . . 274 



Fig. 24-27. Conditions of young developing plants, .... 274 



