CiKLENTEKATES : POLYPS. 



Fig. 4S5. — Acale- 

 phian Coral. 



It was discovered by Professor 

 Agassiz, that there are some kinds of 

 Acalephs which produce coral similar 

 to that formed by Coral Polyps, de- 

 scribed in the following pages, but 

 unlike the latter in having, in the 

 cells, a horizontal floor extending 

 from wall to wall. 



SEA ANEMONES AND CORAL ANIMALS, OR 

 POLYPS. 



These are marine Ccelenterates which have a sacklike 

 or tubular body, with a circular top, in the center of 

 which is an opening called the mouth, and around the 



Fig. 486. — Polyp — Sun Anemone. 



mouth are one or more rows of hollow feelers, or ten- 

 tacles. The mouth opens directly into an inner sack, 

 which is the stomach, and this stomach opens at the 

 bottom into the main body. The main body is divided 



