Fig. 76. — Caxadiax Waterweed \Elodea canadensis). 

 Jl/essrs. Flatters and Garnett (Copyright). 



See pa^s^e 282. 



Fk;. 77.— Water Soldier (^Stratiotes aloides). 

 Messrs. Flattej-s and Garnett (Copyright). 



See page 285. 



