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 



