I! I 



POLYZOA. 



POLYZOA. 



430 



il 



II 



JO, Critia Iriccllata ; a, ovicell. 21, Alecto graiiulala. 22, Idmanea radiant; 

 a, natural size. 23, Tuijulipora icrpmt. 



Gen. 3. llornera, Lamouroux. 



Openings of cells disposed irregularly, or in moro or legg regular 

 opposite transverse series, on one side only of the branches or lobes 

 of the polyzoary. 



MUlepora (sp,), Eaper. 

 Retepora (sp.), Lamarck. 



llornera, Lamouroux ; De Blainvillc ; Milne-Edwards. 

 Several species recent ; many fossil. 



//. Aduatic, s, decumbentes. 



PoljKoarium adnate or suberect above, decumbent and aduate 

 below. 



Family 3. ' Tubullporada, 



Polyzoarium divided into linear or sublinear branches or lobes, 

 sometimes more expanded and locate upwards, always decumbent, 

 and closely adnate. 



Gen. 1. -Alecto, Lamouroux. (Fig. 21.) 



Polyzoarium composed of a single or of multiple series of cells. 

 AUcto, Lamouroux ; Milne-Edwards; Johnston (pars); De Blain- 



ville ; Fleming. 

 MUlepora (sp.), Linn. 

 Aulopora (sp.), Qoldfuss, &c. 

 Three or four species recent ; several fossil. 



Gen. 2. Tubulipora. (Pig. 23.) 



Polyzoarium arising.from a contracted base, and expanding above; 

 either simple or irregularly subdivided; decumbent and adherent 

 below, usually free and suberect above. 



Tulrulifjora, Milne-Edwards (pars); Johnston (pars); Fabricius; 

 Turton ; Gmelin ; Couch (pars) ; Fleming (pare) ; Lamarck 

 (sp.) ; Risso (sp.). 



Tubipora (p.), Linn. ; Jameson ; Stewart ; Bosc. 

 Millejiora (sp.), Ellis and Soland. 

 Cellepora (sp.), Esper. 

 Phtnaa (!), Lamouroux, to. 

 Five or six species recent; several fcxil. 



Family 4. Diacoporada. 



Polyzoarium in the form of a closely adnate, circular, or irregular 

 disc or patch. 



Tubuliporida: (pars), Milne-Edwards, &c. 



Gen. 1. Discopora, Lamarck. 



Polyzoarium a circular disc, either flat, concave, or convex in the 

 centre, with the suberect tubes opening irregularly in all parts of the 

 surface, and usually surrounded by a thin calcareous border. 

 Discopora, Lamarck ; Lamouroux ; Fleming. 

 Tubulipora (pars), Johnston. 

 Melobesia, Audouin. 

 Obdia, Quoy and Gaimard. 

 Madrepora, Ellis and Solander ; 0. Fabricius. 



Gen. 2. Diaitopora, Lamouroux. (Fig. 24.) 

 Polyzoarium more or less depressed, circular, discoid ; the cells sub- 

 alternating, horizontal, immersed ; openings elliptical. 

 Mittepora (sp.), Esper. 

 Macnleripora, De Blainville. 

 Diaslopora, Milne-Edwards (pars); Johustou (sp.); Hageuow 



(pars). 



Aulopora (sp.), Goldfuss. 

 Berenieea (sp.), Lamouroux. 

 Rosacilla, Homer. 



.'I 



24, Diaseoporn (sp. !) ; 25, Seriataria leiidij/era ; a, cr.il setaj. 26, fiulu- 

 lifora, (p. ?). 27, Farrella pralonga. 



Gen. 3. Sefrancia, Bronn. 



Polyzoary either discoid and adnate throughout, or fungiform and 

 attached by a short stem ; openings of tubes disposed in linos or rows 

 radiating from the centre. 

 Pelagia, Lamouroux. 

 Lichcnopora, Michelin. 



Tubulipora, Milne-Edwards (sp.) ; Johnston (sp.) 

 Ceriopora (auct., pars). 

 Defrancia, Bronn. ; Hagenow ; Beusa. 



Sub-Order III. C'tenoalomala. 

 Cells corneous, or fleshy, tubular or depressed, free or coalesoent ; 



