CLASS ACTIXOZOA. 1 5 



cylinder or column, the base of wliicb. forms a broad 

 muscular disc, by means of which the animal fixes itself 



Fig. 5. — A, Actinia mesenibnianthemum, one of the Sea-anemones (after 

 Johnston); B, Section of the same, showing the mouth (a , the stomach 

 (6), and tlie body-cavity (c); the dark and light lines show the two integ- 

 ments of the body. 



to a stone or other foreign body. Though thus rooted 

 habitually, the animal has, however, the power of detach- 



