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HYDROID POLYPES 



FIG. 58. Diphyes campanulata. 



A, the entire colony, natural size, showing stem (a) bearing groups of 

 zooids (e) and two swimming bells (m, m l ), the apertures of which are 

 marked o. 



B, one of the groups of zooids marked e in A, showing common stem 

 (a), hydranth (), medusoid (g), bract (/), and branched tentacle or 

 grappling line (z). (From Gegenbaur. ) 



