KXPLANATIONS AND REFERENCES, 



PLATE CLXIV. 



Figures variously enlarged. 



PAGE. 

 Figs. 1, 2. HYDRURUS FCETIDITS, Var. penicillatus, about half the natural size,187 



" 3, 4. small section of thallus much enlarged, 



showing the scattered cells, . .189 



" 5,6. " " two young plants. . . .189 



Fig. 7-9. three cells taken from matured brnnehlets 



(fig. 4), greatly magnified, . . 189 



" 10-12. progressive conditions of development of 



cells (gonidia), after Rostafinski, . 189 



" 13. " " Cells dividing, " . . 189 



Figs. 14,15. HYDRURUS IRREGULARIS, forma confusa, . . . 189 



" 16, 17. HYDRURUS DUCLUZELII, ..... 189 



