THE JELLY-FISH 1335 



of the Challenger, that some of the polypes act as 

 catchers of food, and feed those which pay especial 

 attention to increasing and multiplying. These last 

 have minute little knobs growing on the stalk be- 

 neath the head, and which develop round bodies in- 

 side. After a while motion is noticed in them, and 

 there is every reason to believe that they burst forth 

 and swim off as small jelly-fish. Some, however, 

 give out little planulas, which settle down and grow 

 like the parent. 



It will have been noticed from this description that 

 these polypes are different in shape from the Garland 

 polypes and that instead of being bell-shaped, with 

 tentacles around the mouth, they are club-shaped, 

 and have more than one row of tentacles half way 

 down. This last shape gives a characteristic to many 

 little polypes which lead, like the others, two lives 

 one fixed on the seashore on plants and stones, and 

 the other, freely swimming, as a pretty little jelly- 

 fish. 



Another kind lives fixed on sea-weeds in shallow 

 water, and its stem consists of 'a single tube, whicH is 

 creeping and threadlike. The cups for the polype 

 are on long stalks, with markings like rings on them, 

 and are bell-shaped with a toothed edge. The mouth 

 is surrounded by tentacles, as in the Garland polype, 

 and, in fact, there is not much outside distinction 

 between them and this Campanularia, or Bell 

 polype. 



There is a stomach in the polype bud which leads 

 to a canal that goes down the stalk, and even into the 

 creeping stem or root. The buds, on stalks of their 



