650 THE POPULAR SCIENCE MONTHLY. 



mouth is situated lower down (see Fig. 2), and works something like 

 a steel-trap. Well, the little monad has got into this opening and 

 seems to have recovered from its fright, as there is plenty of room 

 for it to float about here ; but the Floscule is now on the alert, the 

 monad is doomed ! If it tries to escape, those lobes that stand up so 



Fig. 3. 



Caechesium Poltpinum.— (Tree Vorticella.) 



innocent-like, with their beautiful fan-shaped filaments, immediately 

 curve over and close the opening. This movement of the Flf)scule 

 usually sends the little monad close to that terrible steel-trap, when it 

 is snapped up in a moment. Our ears are so heavy and dull, or we 



