8o 



INDIVIDUALITY IN ORGANISMS 



each new individual thus formed chains of from eight 

 to sixteen individuals or zooids, as they are usually 

 called, in various stages of development may result 



FIGS. 25-27. Pennaria tiarella: Fig. 25, h, h', h", Figs. 26 and 

 27, stages of development of hydranth; m, medusa bud. 



(Fig. 29). Many other cases of division among animals 

 are essentially similar. 



In many of the lower animals agamic reproduction 

 can be induced experimentally by isolating pieces. In 



