64 
GUIDE TO THE CORAL GALLERY. 
Case 3, 
Upright part. 
Ctenophora (Comb- Jellies). 
Ctenophora are free-swimming Coelentera which never form 
colonies. The body, usually oval or spheroidal, is provided with 
eight rows of swimming-plates situated along eight meridians, each 
Fig. 26. 
d 
Hormipliora plumosa. a, mouth ; b, 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 
