458 CLASSIFICATIONS OF ZOOPHYTES. 



henceforth reinstate the apolypous sponges and vegetating co- 

 rallines, which he has so properly separated, to a rank amongst 

 proper polypes ; and his removal of the Madrepores from 

 the compound hydracolous polypidoms to a level with the 

 Actinias seems to be equally judicious, and beyond future 

 cavil. 



System of H. M. D. De Blainville. (1834.) 



Class— ZOANTHA. 



Body regular, resembling a flower, more or less elongated, free or 

 fixed, very contractile, furnished with an intestinal canal without 

 distinct parietes, and with a single large terminal aperture encir- 

 cled with multiform tentacula, always hollow, and in communica- 

 tion with the musculo-cavernous parenchyma of the skin. 

 The class is divided into three families : 



The soft — Actiniadje. Lucernaria, Actinia, &c. 

 The Coriaceous — Zoanthus. 



The Calcareous — divided into 1. the Madrejihyllicea, in which are 

 the genera Turbinolia and Caryophyllfea ; and 2. the Ma- 

 drepores. 



Class— POLYPIARIA. 



Animals like the Hydra, viz. in general slender, furnished with a 

 single series of filiform and not numerous tentacula, naked or con- 

 tained in multiform cells (but never lamelliferous), clustered so as 

 to form a polypidom very variable in shape and structure. 

 Sub-Class 1, P. SoLiDA. — Containing the family Millejyores, of 

 which there is no British genus amongst recent zoophytes ; 

 and Tubuliporea which contains Tubulipora only. 

 Sub-Class II. P. Membranacea — in which are the three families 

 — 1. F. operculifera, of which the British genera are Es- 

 chara, Retepora, Cellepora, Berenicea, Discopora, and 

 Membranipora j 2. P. cellarioea containing Flustra, Cellaria, 

 Tricellaria, Acamarchis, Bicellaria, Crisia, Gemicellaria, 

 Unicellaria, Catenicella ; 3. Sertulariccea — arranged 

 thus : — 



