2 TABULATE CORALS. 



cavity, instead of occupying only the one or two loculi. It is 

 also to be remembered that the septal apparatus, though more 

 or less rudimentary, has the same general mode of arrangement 

 as in the preceding sub-orders " {Aporosa and Perforata), " and 

 never presents the crucial character which we shall find in the 

 Zoantharia RugosaP They also divide the " Tabulata " into 

 the following four families, comprising the under-mentioned 

 genera : — 



Fam. I. MiLLEPORiD^. — Corallum principally composed of a very abundant 

 ccenenchyma, distinct from the walls of the corallites, and of a tubular or 

 cellular structure. Septa not numerous ; tabulae numerous and well formed. 

 Genera — MiUepm'a, Lam.; LLeliopora, De Blainv. ; LLeliolites, Dana; Fishili- 

 pora, M'Coy ; Plasmopora, Edw. and H.; Fropora, Edw. and H. ; Axopora, 

 Edw. and H. ; Lobopora, Edw. and H. 

 Fam. II. FAVosiTiDiE. — Corallum essentially formed by lamellar walls, with 

 little or no ccenenchyma. Visceral chambers divided by numerous and 

 well-developed complete tabulae. 



Tribe i. Favositina. — Corallum massive. Walls perforated. Septa rudi- 

 mentary. No ccenenchyma. Genera — Favositcs, Lam. ; Michelinia, 

 De Kon. ; Koninckia, Edw. and H. ; Alveolites, Lam. 

 Tribe 2. Chceietina. — Corallum massive. Walls not perforated. Neither 

 septa nor ccenenchyma. Genera — Chcetetes, Fischer; Dania, Edw. 

 and H ; Steiwpora, Lonsd. ; and Constellaria, Dana. 

 Tribe 3. Halysitince. — Corallum composed of corallites constituting verti- 

 cal lamina or fasciculi, but more or less free laterally, and united by 

 means of connecting tubes or mural expansions. Walls well developed, 

 and not porous. Septa distinct, but small. Genera — Lialysites, 

 Fischer; Harmodites, Fischer (subsequently abandoned for Syringo- 

 pora, Goldf.), and Thecostegites, Edw. and H. 

 Tribe 4. Pocilloporina. — Corallum massive, gibbous, or subdendroid, 

 with thick imperforated walls, forming towards the surface an abun- 

 dant compact ccenenchyma. Septa quite rudimentary. Genus — 

 Pocillopora, Lam. 

 Fam. III. Seriatoporid.*;. — Corallum arborescent or bushy, with an abun- 

 dant compact ccenenchyma. Visceral chambers filling up by the growth 

 of the columella and the walls, and showing but few traces of tabulse. 

 Genera — Seriatopora, Lam. ; Dendropora, Michelin ; Rhabdopora, Edw. 

 and H. 

 Fam. IV. Thecid^. — Corallum massive, with an abundant, compact, spuri- 

 ous ccenenchyma, produced by the septa becoming cemented together 

 laterally. Tabulae numerous. Genus — Thecia, Edw. and H. 



Various additions, modifications, and improvements in the 

 above classification of the " Tabulata'' were made by Milne- 



