6o8 THE INVERTEBRATA 



definitive buds. These fasten themselves in a lateral and a median 

 row on each side. Eventually they grow into individuals of three 

 kinds, which co-operate in a remarkable manner. Those of the lateral 

 row become gasterozooids which gather food for the community, those 

 of the median row phorozooids which act as nurses, and others ^owo- 

 zooids carried by the phorozooids. The latter presently break free 

 with their charges, which are ultimately liberated to reproduce 

 sexually. 



Doliolum (Fig. 458). 



