12 



SEA-ANEMONES AND CORALS. 



sac forms a cavity in the middle of the body, the rest 

 cf the space being divided by a number of partitions, 



\yP 



No. 5. 



No. 6. 



running from top to bottom, and radiating from this 

 central sac to the outside ; so that looked at from 

 above they run from the middle to the edge like the 

 spokes of a wheel (No. 7), but seen in a vertical cut, as in 



No. 6, they run from the sum- 

 mit to the base. Now, in order 

 that you may understand how 

 he digests his dinner when he 

 has caught and killed it, you 

 must know that the sac or stom- 

 ach in the middle of the body 

 opens by an aperture in the 

 bottom iLto the main body. 

 The sea-water, which enters 

 freely through the mouth with 

 the food, softens it, helps reduce it to a kind of pulp, 



No. 7. 



