io8 



ELEMENTS 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 of Clytia (Campannlartal Johnstoni, magnified ; / 

 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 



