TRIBE I. ASTR^ACEA. 
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shallow, broad at bottom; lamellaB thin, denticulate; in a transverse section, 
stars multiradiate, with the cellules simple ; septa nearly solid, with a few 
linear or >■ - form cellules. 
Plate 10, fig. 1 a, transverse section ; 1 &, vertical section. — West Indies. 
3. A. Orbicella GLAUCopis {Dana). — Very large, hemispherical; polyps 
a little prominent, with 48 lamellae. Corallum subcellular: stars in a trans- 
verse section, suborbiculate, 4 to 5 lines broad, finely 24 to 26-rayed, with 
the cellules simple; septa subcellular; the cellules linear and >■- shape, nu- 
merous. 
Plate 10, fig. 2ffl, a vertical section; 26, transverse section; both natural 
size. — The Feejee Islands. — Exp. Exp. 
4. A. Orbicella patula { Dana ). — ‘Very large, hemispherical, dark-umber 
colored ; polyps 6 to 8 lines broad, with the disks radiated with pale gray. 
Corallum cellular; calicles polygonal, flat conical, or nearly flat, evenly and 
crowdedly striate without, and denticulate ; cells very shallow, not coronate ; 
lamellae incrassate, spinoso-denticulate : in a transverse section, stars many- 
rayed, rays thick and nearly contiguous ; septa with a few narrow cellules. 
! Plate 10, fig. 14, part of a corallum with the animals unexpanded; a, sec- 
tion showing outline of cells and ridges, and the dentation of the lamellae ; 
6, an enlarged view of the same ; c, d, vertical sections, natural size ; e, trans^ 
j verse section. — ^The Feejee Islands. — E.ip. Exp. 
' 5. A. Orbicella curta { Dana ). — Convex; polyps a little prominent, 3 to 
4 lines broad, with 48 internal lamellae. Corallum very minutely cellular ; 
calicles short, round, conical, crowdedly and evenly striate and finely denticu- 
ilate without; cells orbicular, 2^ lines broad, rather deep, subcoronate wfithin ; 
lamellae almost equally exsert, denticulate: in a transverse section, stars with 
many rays, and cellules sparingly subdivided; septa usually minutely cellular, 
with the cellules linear or > - shape. 
Plate 10, fig. 3, a, enlarged profile view of cell and lamellae ; 6, enlarged 
Transverse section ; c, vertical section, natural size. — The Feejee Islands. — 
\Exp. Exp. 
il 6. A. Orbicella rotulosa (£'Z/iV).—Subglobose, polyps a little promi- 
I nent, with 36 (.^) internal lamellae. Corallum with the calicles very short cyl- 
jiindrical; lamellae unequal and very unequally exsert; cells 2 to 2h lines 
i broad, with a corona of 6 to 8 teeth. 
! West Indies —Ellis, Lamarck. 
I 7. A. Orbicella coronata (Duuu).— Convex, subglobose ; polyps a little 
prominent, 2^ to 3 lines broad, with 36 internal lamellae. Corallum subcellu- 
jlar; calicles very short cylindrical with the lamellae unequal and unequally 
exsert, numerous ; cells 2 lines broad, circular, rather shallow, coronate within 
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