MADREPORARIA. 



259 



Fig. 496. — Same as Fig. 498. 

 Closed. 



Fig. 497 — Same as Fig. 498. 

 Just opening. 



Fig 498 



■ Sea Anemone, or Fringed 

 Actinia. 



Fig. 499. — Sea Anemone, 

 or Bunodes. 



are very beautiful and exceedingly variou.s, and they 

 are among the most beautiful objects in zoological cabi- 

 nets. 



The great group of Madrepores contains Polyps 

 which have a definite number of tentacles, twelve or 

 more; those called Porites, Figure 501, have the cells 

 shallow, and are not more than one twelfth of an inch 

 in diameter, the coral in some cases branching, in 

 others massive, and always very solid. Massive speci- 

 mens of Porites are sometimes fifteen feet in diameter. 



