134 



SENESCENCE AND REJUVENESCENCE 



advanced stage before they separate from the parent body. In 

 such forms the body consists visibly of a chain of zooids in various 



I. 



2. 



37 



1.2. 



2. 



i.i.i. 



1. 1.2. 



1.2. 



tr- 



I.I.I. 



r - r ~Q 



2.2. 





FIGS. 37-40. Progress of agamic reproduction in Steno- 

 stomum: the sequence in the formation of new zooids is indi- 

 cated by the numerals. 



stages of development. The development of such a chain of 

 zooids in Stenostomum is shown in Figs. 37-40. In Fig. 37 only 

 the zooids i and 2 are present; in Fig. 38 zooid i has divided into 



1. 1.2. 



1.2. 1. 



1.2.2. 



2.1.1. 



2.1.2. 



2.2. 



