252 



HYDROID POLYPES 



LESS. 



Jl. 



cr> 



FlG. 58. DipJiyes campamilata. 



A, the entire colony, natural size, showing stem (a) bearing groups 01 

 zooicls (e) and two swimming bells (;//, /;/), the apertures of which are 

 marked o. 



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

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

 grappling line (?'). (From Gegenbaur. ) 



