Typical genera--_Pocillopora_, Lamarck. _Seriatopora_,
Lamarck.

Family 7. MADREPORIDAE.--Colonial branching or palmate perforate
corals, with abundant trabecular coenenchyme. Theca porous; septa
compact and reduced in number. Typical genera--_Madrepora_, Linn.
_Turbinaria_, Oken. _Montipora_, Quoy and G.

Family 8. PORITIDAE.--Incrusting or massive colonial perforate corals;
calices usually in contact by their edges, sometimes disjunct and
immersed in coenenchyme. Theca and septa perforate. Typical
genera--_Porites_, M. Edw. and H. _Goniopora_, Quoy and G.
_Rhodaraea_, M. Edw. and H.

GROUP C.

Family 9. CYATHOPHYLLIDAE.--Solitary and colonial aporose corals.
Tabulae and vesicular endotheca present. Septa numerous, generally
radial, seldom pinnate. Typical genera--_Cyathophyllum_, Goldfuss
(Devonian and Carboniferous). _Moseleya_, Quelch (recent).

Family 10. ASTRAEIDAE.--Aporpse, mainly colonial corals, massive,
branching, or maeandroid. Septa radial; dissepiments present; an
epitheca surrounds the base of massive or maeandroid forms, but only
surrounds individual corallites in simple or branching forms. Typical
genera--_Goniastraea_, M. Edw. and H. _Heliastraea_, M. Edw. and H.
_Maeandrina_, Lam. _Coeloria_, M. Edw. and H. _Favia_, Oken.

Family 11. FUNGIDAE.--Solitary and colonial corals, with numerous
radial septa united by synapticulae. Typical genera--_Lophoseris_, M.
Edw. and H. _Thamnastraea_, Le Sauvage. _Leptophyllia_, Reuss
(Jurassic and Cretaceous). _Fungia_, Dana. _Siderastraea_, Blainv.

GROUP D.

Family 12. EUPSAMMIDAE.--Solitary or colonial perforate corals,
branching, massive, or encrusting. Septa radial; the primary septa
usually compact, the remainder perforate. Theca perforate. Synapticula
present in some genera. Typical genera--_Stephanophyllia_, Michelin.
_Eupsammia_, M. Edw. and H. _Astroides_, Blainv. _Rhodopsammia_, M.
Edw. and H. _Dendrophyllia_, M. Edw. and H.

GROUP E.

Family 13. CYSTIPHYLLIDAE.--Solitary corals with rudimentary septa,
and the calicle filled with vesicular endotheca.
Genera--_Cystiphyllum_, Lonsdale (Silurian and Devonian).
_Goniophyllum_, M. Edw. and H. (In this Silurian genus the calyx is
provided with a movable operculum, consisting of four paired
triangular pieces, the bases of each being attached to the sides of
the calyx, and their apices meeting in the middle whe