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GUIDE TO THE CORAL GALLERY. 



Ctenophora (Comb- Jellies). 



Case 3, Ctenophora are free-swimming Coelentera. which never form 



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



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



Hormiphora 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 



