52 



MAKVELS OF POND-LIFE. 



sion of the anemone poison threads, which he considers 

 hollow, to the injection of a fluid. In their quiescent 



Anguillula pierced by stinging organs of the Hydra viridis. 



state, he thinks they are drawn in, like the finger 

 of a glove, and are forced out as the liquid enters 



