EXPLANATIONS AND REFERENCES, 

 PLATE LXIV. 



PAGE. 

 Fig. 1. BATRACHOSPERMUM VAGUM, Var. keratophytum, natural size, 58 



" 2. '' '* end of a filament magnified, . 5H 



"3. " "two whorls of same under higher 



power, . . . .58 



Figs. 4, 5. Var. KUEHNIANUM, sections moderately magnified, . 57 



Fig. 6. BATRACHOSPERMUM MONILIFORME, Var. atrum, natural size. 



The same magnified, Plate LXI1I, 

 fig. 9, . . . 57 



