EXPLANATIONS AND REFERENCES, 

 PLATE CIII. 



PAGE. 

 Fig. 1-3. CHAETOPHORA PISIFORMIS, thalli natural size, as frequently 



found attached to submerged 

 grasses, . . .116, 114 



Figs. 4, 5. CHAETOPHORA ELEGANS, two sections of thalli largely mag- 

 nified. Showing the arrangement of 

 the filaments and character of 

 branching,. . .116 



Fig. 6. A branch producing zoospores, ... 116 



" 7. Natural size of thalli attached to a submerged leaf, . .116 



" 8-10. Three threads developing long, branched Stigeocloniuni-like 

 filaments. For higher developments or maturer growth, 

 see Plate C, fig. 1, .116 



" 11. CHAETOPHORA TUBERCULOSA, thalli of larger size, . .116 



" 12-15. CHAETOPIIORA PISIFORMIS, thalli as they sometimes appear on 



the surface of river pebbles, prim- 

 arily very small then increasing in 

 size, . . . .116 



" 16. CHAETOPHORA LONGIPILA, natural size of thalli, . . 118 



" 17. A thallus greatly magnified, . . . . .118 







" 18. CHAETOPHORA MONILIFERA, a thallus magnified, . 118 



" 19. Thalli natural size, . . . . .118 



