425 



POLYZOA. 



POLYZOA. 



426 



Gen. 1. Flustra, Liuuicus. 

 Cells contiguous ; on both sides of the frond. 

 Flustra (sp.), Linn. ; Lamarck ; Gray. ; &c. 

 Five species. 



Gen. 2. Carlasea, Gray. (Fig. 12.) 

 Cells contiguous ; on one side only of the frond. 

 f lustra (sp.), Linn. ; Johnston. 

 Carbasea, Gray ; ' Brit. Mus. Cat.,' p. 50. 

 Ten species. 



Gen. 3. Diachons, Busk. (Fig. 13.) 



Cells disjunct ; each connected with six others by tubular processes', 



iJiachoris, Busk., ' Voyage of Rattlesnake,' 

 Three specie 3 , 



u; 



18, Diachoris magfllanica ; a, avicularia. 14, Ueaibi'anifiora coriacea. 15a, 

 Young itate of Lepralia ciliala. 



Family 9. Afembranipwuke, Busk. 



Polyzoary membranaceo-calcareous, or calcareous, expanded, encrust- 

 ing (sometimes foliaceous, contorted, and suberect). Cells horizontal, 

 quincuncial, or serial. 

 Fluslra, Lino. (pars). 

 Flustrada (pars), Gray. 

 CeUeporidte (pars), Johnston. 



Itembraniporida, Bugk. ; ' Brit. Mus. Cat.,' p. 55. 

 * Cells more or less open in front, with raised margins. 



Gen. 1. Hembranipara, Johnston. (I'i'J- 14.) 



Polyzoary encrusting (or suberect, foliaceous, and contorted), spread- 

 ing irregularly. Cells more or less irregularly disposed or quincuncial, 

 with raised margins ; a greater or less extent of the aperture occupied 

 by a thin membrane. 



Eichara (pars), Pallas. 



Pluttra (sp.), Linn. ; Esper ; Berkeley ; Lamarck ; Grant ; Fleming ; 



Risso ; Johnston ; Lamouroux. 

 Membranipara, Johnston ; ' Brit. Mus. Cat.,' p. 56 ; \V. Thompson ; 



Hawaii. 



Ditcopora (pan), Lamarck. 

 Annulipora, Conopeum, Callopora, Ampliiblettrum, Micropora, 



Gray. 



Eighteen species. 



** Aperture of cells entirely filled in by a convex calcareous expan 



sion. Cells disposed in more or less regularly radiating line?. 



Gen. 2. Lepralia, Johnston. (1'<'J>- 15 & 15a.) 



15, Lejiratia Feachii. 1C, Cellepora pumicoia. 



Polyzoarium adnate, crustaceous, spreading from a centre in a more 

 or less circular form ; composed of contiguous, or connected, calca- 

 reous, decumbent cells, the wall of which is complete in front. 

 Etchara (sp.), Moll. ; Pallas. 



Lepralia, Johnston ; Gray ; ' Brit. Mus. Cat.,' p. 63. 

 Ba-enicea, Fleming (non Lamouroux nor Peron). 

 Escltarina (sp.), Milne-Edwards; Gray. 

 Etcharoidts (sp.), Milne-Edwards. 

 Cdlepvra (sp.), Oken ; Audouin (pars) ; Lamouroux (pars) ; Hage- 



now (pars). 

 Fluitra (yarior). 



Diicopora, Lamarck (pars) ; Gray (pars) ; Lamouroux (pars). 

 Cribrillina, Herentia, Escharella, Porella, Celleporella (all ap.), 

 Gray. 



1. Armatce. Species provided with either avicularia or vibracula. 



.1. Species having avicularia. 

 -. Median and single. 



* Superior (above the mouth). 

 ** Inferior (below the mouth). 

 $. Avicularia double, or azygous and lateral on each cell, 



or only on some cells in the polyzoary. 

 B, Species having vibracula. 



2. Inarmata. Species without either avioularia or vibracula. 



a. With oral spines. 

 ft. Mouth unarmed. 

 About fifty or sixty species. 



Family 10. CMeporidae, Busk. 



Polyzoarium composed of cells, standing more or less vertical to its 

 axis or plane, heaped together, or irregularly overlying each other. 

 Cdlepmidw, Johnston (pars) ; ' Brit. Mus. Cat.,' p. 58. 



Gen. 1. Cellepora, 0. Fabriciua. (Pig. 16.) 



Polyzoarium calcareous, rigid, adnate or erect, composed of urceolate, 

 suberect, contiguous cells, heaped together irregularly, or arranged 

 qrincuncially. An ascending rostrum on one or both sides of the 

 mouth usually furnished with an avicularium. 



Cellepora (ap.), 0. Fabricius; Johnston; Linnteus; Muller ; Ber- 

 keley; Stewart; Lamarck; Lamouroux; Fleming; Olivi. 

 Spongitet, Oken. 

 Tnbipora (pars), Linn. 



Millepora (pars), Pallas ; Ellis and Solander (pars). 

 Etchara (pars), Pallas. 



* Adnate, globose, or spreading. 

 * Erect. 

 Eight species. 



Family 11. Escharidce, Busk. 



Polyzoary erect, rigid, foliaceous and expanded, lobate or reticulate 

 Cells disposed quincuncially in the same plane, on one or both surfaces 

 Eicharidas (pars), Johnston. 

 Lepraliance (pars), Gray. 

 Reteporance, Gray. 



Gen. 1. Eicltara, Ray. (Fig. 17.) 



Polyzoarium foliaceous and expanded, or contorted, or branched and 

 sublinear. Cells disposed on both surfaces, back to back, immersed, 

 coalescent, horizontal to the plane of the axis. 



Etchara, Ray ; Fleming ; Johnston ; Lamarck ; Gray ; Pallaa 



(pars) ; Moll (pars) ; ' Brit. Mus. Cat.,' p. 89. 

 Nullipora (sp.), Solander. 

 Cellepora (sp.), Esper. 



