218 HISTOEY OF BRITISH ZOOPHYTES. 



** Coral with terminal cells. OCELLINA. 

 Coral free, the base pointed. TUEBINOLIA. 

 Coral fixed, the base expanded. CAEYOPHYLLEA. 

 Sect. II. Body coriaceous or fleshy. 



* Polypes associated by a common base (gemmiparous) . 



ZOANTHINA, Mrenberg. 

 Base root-like, creeping. ZOANTHTJS. 

 ** Polypes separate and single (ovo-viviparous). ACTINIA 



Ehrenberg. 



Tentacula in uninterrupted circles. ACTINIADJE. 

 t Tentacula imperforate. 



Body invested in a lobed epidermis. CAPNEA. 

 Epidermis normal. COEYNACTIS. 

 tt Tentacula tubular, retractile. 



Base broad, the animal immoveable. ADAMSIA. 

 Base broad, the animal locomotive. ACTINIA. 

 Base narrow, the animal unfixed. ILUANTHOS. 

 ttt Tentacula tubular, not retractile. ANTHEA. 

 Tentacula in tufts, at distant intervals. LUCERNIAD^E. 

 One genus only LUCEENABIA. 



