HYDRA 



305 



Obella hab'ib 



Mouth ^ 



Hydrotheca — . 



Coelenteron '- 



intodeirn) 



ictode rm 



Qonotheca 

 MedusQ'bud 

 Bla5to^ty/e - 



Radiol canah, 



Reptoduciive 

 Ofgan--- 



Houbh #^^;; 



Jtatocyjfc— - 

 Tentacles- 



hledusa 



Obelia 



Fig. I05.-Ohelia, hydrozoan colonial coelenlerate f owing ^se^usA gneratjon 

 :ual generation (medusa), structure, and h.-ibit of life. (Courtesy ot c^enerai 



sexual generatio 

 Biological Supply House.) 



