JELLY FISH'S POISONOTJS STING. 95 



walls give way, and the poison-thread is shot out to a 

 wonderful distance, its base still remaining attached to 



Fig. 3. RHIZGSTOMA, OR ROOT-MOUTHED. 



the cell whence it sprang. Supposing the cell to be as 

 large as an ordinary grape, the thread would be six feet 



