SEA-ANEMONES AND CORAL ANIMALS. 



237 



SEA-ANEMONES AND CORAL ANIMALS, OR 

 POLYPS. 



These are marine radiates which have a sack-like or 



Fig. 485. Polyp. A Sea-Anemone. 



Fig. 486. Cluster of Coral Polyps in various stages of expansion. 



tubular body, with a circular top, in the centre of which 



