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GUIDE TO THE CORAL GALLERY.. 



Ctenophora (Comb-Jellies). 



Case 3, Ctenophora are free-swimming Coelentera \\ hich never form 



colonies. The body, usually oval or spheroidal, is provided with 

 eight rows of swimming-plates situated along eight meridians, each 



Hormiplwra plumosa. a, mouth ; 6, swimming plates. (After Chun.) 



plate consisting of a comb-like band of very large cilia. The mouth, 

 situated at the oral pole, leads into a gullet and stomach, whence 

 canals proceed to run beneath the swimming-plates ; canals also 

 pass upwards from the stomach to the aboral pole, where they open 



