ZOOPHYTES. 
3 
rayed (rays more than twelve), margin of calicles thin, interstices not lamello- 
striate. (Lamellae nearly or quite entire.) 
Genera. Ecmesus, Cyathina, Stephanophyllia, Turbinalia, Desmophyllum, 
Culicia, Caryophyllia, Dendrophyllia, Oculina, Anthophyllum, Stylina, As- 
troitis. 
Family III. Gemmiporidje. Coralligenous, tentacles short, marginal, in 2 
to 3 series, disk broad and a little convex : coralla porous; calicles with a 
stout margin, lamellae even and not exsert. 
Genera. Gemmipora, Astraeopora (?). 
Family IV. Zoanthid^. Not coralligenous, exterior subcoriaceous; ten- 
tacles short, marginal, in 2 or 3 series ; disk often convex with the margin ra- 
diately striate and sometimes much reflexed. 
Genera. Isaura, Zoantha, Palythoa. 
Tribe III.— MADREPORACEA. 
Tentacles in a single series, 12 (rarely more), sometimes obso- 
lete; gemmiparous, gemmation lateral: coralligenous, coralla 
calcareous, cells quite small, rays 6 to 12 or obsolete ; interstitial 
surface not lamello-striate. 
Family I. Madreporid^. Polyps with 12 tentacles, not secreting lime at 
middle part of base ; and hence the cells deep, extending to the centre of the 
cora.llum. 
Genera. Madrepora, Manopora. 
Family II. Favositid^. Polyps with 12 tentacles, secreting lime period- 
ically at base, and hence the cells have a calcareous bottom and in the inte- 
rior of the corallum are transversely septate, rarely solid. 
Genera. Alveopora {JJlveoporinre)’, Sideropora, Seriatopora, Pocillopora, 
Stenopora, Constellaria, Favosites, Catenipora [Favositince) ; Heliopora, Heli- 
olites, Millepora [Helioporince). 
Family III. Poritid.®. Polyps with rarely more than 12 tentacles, form- 
ing porous calcareous secretions continuously at base ; coralla every where 
equally fine-porous, cells shallow or superficial and scarcely traceable within 
the corallum, rays indistinct. 
Genera. Porites, Goniopora. 
Tribe IV.— ANTIPATPIACEA. 
Animals with 6 tentacles, forming at base corneous secretions. 
Family I. ANTiPATHiOiE. Animals fleshy, enveloping a corneous spinu- 
lous axis. 
