ANTHOZOA IIEL1ANTHOIDA. 



193 



The British species may be arranged under the following 

 families and genera : 



SECT. I. Body secreting a calcareous polypidom. CORALS. 



* Coral cellular throughout. MILLEPOEINA, Ehrenberg. (Les 



Madrepores, Blainmlle. Lithophyta porosa, Schweigger.) 

 Cells substellate with porous interspaces. POCILLOPORA. 



* * Coral with terminal cells. OCELLINA, Ehrenberg. (Madre- 



phylliaea, Blainmlle. Lithophyta lamellosa, Schweigger. 

 Madreporidae, J. E. Gray.) 



Coral free, the base pointed . . TURBINOLIA. 



Coral fixed, the base expanded . CARYOPHYLLIA. 



SECT II. Body coriaceous or fleshy. 



* Polypes associated by a common base. (Gemmiparous.) Zo- 



ANTHINA, Ehrenberg. 



Base root-like, creeping . .. . ZOANTHTJS. 



* * Polypes separate and single. (Ovo-viviparous.) ACTININA, 



Ehrenberg. 



Tentacula in uninterrupted circles. ACTINIADJZ. 

 t Tentacula imperforate. 



Body invested in a lobed epidermis . CAPNEA. 



Epidermis normal .... CORYNACTIS. 

 t t Tentacula tubular, retractile. 



Base broad, the animal immoveable . ADAMSIA. 



Base broad, the animal locomotive . , ACTINIA. 



Base narrow, the animal unfixed r ILITANTHOS. 



1 1 1 Tentacula tubular, not retractile . ' * ANTHEA. 



Tentacula in tufts, at distant intervals. LUCERNA- 

 JRIAD^E. 



One genus only , , . . LUCERNARIA. 



