296 SEA-ANEMONES, ZOOPHYTES, ETC. 



the compound corals, which are chiefly reef-building, 

 the individual zoophytes are usually smaller, as in the 

 Millepores. Two of our British genera are Caryo- 



Fig. 227. 



Balanophyllia regia. 

 Fig. 228. 



Caryophyllia. 



phyllia and Balanophyllia. They may be seen alive 

 in nearly all our aquaria, and should be examined 

 in order to gain a clear idea of what a coral animal 

 really is like. It is very difficult to convey the correct 

 idea people have called them " insects," and ima- 



