io8 



ELEiMENTS OF BIOLOGY. 



zooids now appear as entirely independent beings, which 

 are known as Jelly-fishes, and which are so unlike the 

 colony from which they spring that they were originally 

 described as distinct animals. Each generative zooid or 



Fig. 30. — Portion of the colony c>{ Clytin (Cnvt/'afiularia) Johnsioni, magnified ; p 

 Nutritive zooid ; ^Capsules in which the reproductive zooids are produced. 



" medusoid" (fig. 31) consists of a little transparent glassy 

 disc or bell, from the under surface of which there is sus- 

 pended a modified zooid or " polypite," in the form of a 



