ii8 CCELENTERATA. 



Fig. 51.— Colony of Obelia Geniculata (Magnified). 



Growing Apex. y-\ 



^. t' 



Medusoid. 



Sporosac. 



Polype 



~Coenosarc. 



Coenosarc of basal portion. 



/ 



We may therefore regard Obelia as formed of a colony of individuals 

 like Hydra, organically connected by the coenosarc. In this we are 



