TRIBE III. MADREPORACEA. 
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12. Po RITES coNTiGUA (Esper,) Dana. — Cespitose, crowdedly ramose, 
above convex, alive for inches ; branches compressed, crispate, lobed and 
angular, li to 3 lines thick at summits, obtuse. Corallum firm ; cells none, a 
very minute indistinct pore (seen by a lens), surrounded by six granules, other 
granules scattered. 
Plate 54, fig. 6, part of clump of corallum, natural size ; 6 a, surface, en- 
larged. — Feejee Islands. — Exp. Exp. 
13. PoRiTES astra:oides (Lesueur). — Incrusting, undate and somewhat 
gibbous, polyps sulphur-yellow ; tentacles brown, yellow at tip, with a black 
puncture at the extremity. Corallum firm, cells rather large, subangular or 
circular, cylindrical and deep, with 12 radiating lamellae, nearly vertical and 
narrow, and at centre a very short columella. 
Guadaloupe, West Indies. — Lesueur. 
14. PoRiTES CONGLOMERATA. — Subglobose, gibboso-glomerate. Corallum 
having the cells angular, quite shallow, flat-conical, rather small (f of a line) ; 
septa very thin and acute. 
Plate 55, fig. 3, corallum, natural size ; 3 «, cell, enlarged. — The Pacific and 
Indian Oceans. Feejee Islands. — Exp. Exp. 
15. PoRiTES LOBATA {Dana). — Lobato-glomerate, very thick lamellar, and 
gibbous. Corallum having the cells angular, piano-conical, rather large 
(nearly f of a line) ; septa very thin and acute. 
Plate 55, fig. 1, corallum, natural size ; 1 «, 1 &, cells, enlarged. — Sandwich 
Islands. — Exp. Exp. 
16. PoRiTES FRAGOSA {Dana). — Erect-glomerate, with the surface suban- 
gular and coarsely monticulose, Corallum having the cells subangular, shal- 
low, rather small (|- of a line broad), plane at bottom ; septa obtuse. 
Plate 55, fig. 9, surface of corallum, natural size ; 9 a, cells enlarged.-— 
Feejee Islands. — Exp. Exp. 
17. PoRiTES LiMOSA {Dana). — Gibboso-subglobose. Corallum having the 
cells shallow, large (four-fifths of a line broad), plane at bottom ; septa obtuse, 
but thin. 
Plate 55, fig. 2, corallum, natural size; 2a, cells, enlarged, — The Feejee 
Islands, in shallow waters, near the shores, where often muddy. — Exp. Exp. 
18. PoRiTES FAVOSA [Dana). — Stout columniform, surface subgibbous, 
summit truncate. Corallum having the cells deep, rather large, conical ; 
septa acute and durable. 
Plate 55, fig. 4, corallum, natural size ; 4 a, cells, enlarged. — Feejee Islands. 
—Exp. Exp. 
19. PoRiTES CRIBRIPORA {Dana). — Incrusting and glomerate, margin of 
the incrusting mass stout, and involuted or folded under; surface small gib- 
