THE CCELENTERATES 



39 



anemones, described in the next section. In the course of 

 time remarkable changes ensue, which first manifest them- 



FIG. 22. Stages in the development of a scyphozoan jelly-fish, a, the attached 

 young, which in b has separated into a number of disks, each of which becomes a 

 jelly-fish, c. After KORSCHELT and HEIDEB. 



selves in a series of grooves encircling the body. These 

 grow deeper, and the body of the animal finally comes to 

 resemble a pile of sau- 

 cers with the edge of 

 each developed into a 

 number of lobes (Fig. 

 22, I). One after an- 

 other each saucer, to 

 preserve the simile, 

 raises itself from the 

 top of the pile and 

 swims away, and is 

 clearly seen to be a 

 jelly-fish, though con- 

 siderably unlike the 

 adult. As growth pro- 

 ceeds, however, it un- 

 dergoes a series of transformations which result in the 

 adult form. 



FIG. 23. An attached scyphozoan jelly-fish 

 (Halidystus). Natural size, from Nature. 



