ANTHOZOA HELIANTHOIDA. 



193 



The British species may be arranged under the following 

 families and genera : 



Sect. I. — Body secreting a calcareous polypidom. Coeals. 



* Coral cellular throughout. Milleporina, Ehrenberg. (Les 



Madrepores, BlainviUe. Lithophyta porosa, Schweigger.) 



Cells substellate with porous interspaces. Pocillopora. 



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



phylligea, BlainviUe. Lithophyta lamellosa, Schweigger. 

 Madreporidoe, J. E. Giriy.) 



Coral free, the base pointed . . Turbinolia. 



Coral fixed, the base expanded . Cartophyllia. 



Sect II. — Body coriaceous or fleshy. 



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



anthina, Ehrenberg. 



Base root-like, creeping . . . Zoanthus. 



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



Ehrenberg. 



Tentacula in uninterrupted circles. AGTINIADM. 



t Tentacula imperforate. 



Body invested in a lobed epidermis 

 Epidermis normal .... 



t t Tentacula tubular, retractile. 



Base broad, the animal immoveable 

 Base broad, the animal locomotive 

 Base narrow, the animal unfixed 

 1 1 1 Tentacula tubular, not retractile 



Tentacula in tufts, at distant intervals, 



EIAD^. 

 One genus only .... 



Capnea. 



Corynactis. 



Adamsia. 



Actinia. 



Iluanthos. 



Anthea. 



LUCERNA- 



Lucernaria. 



o 



