26 
TRIBE I. ASTR.-EACEA. 
with 10 to 12 minute points: in a transverse section, septa nearly solid, i 
often with delicate cellules, which are sometimes numerous; stars many- 
rayed, cellules simple. 
Plate 10, fig. 4 a, part of corallum, natural size ; b, calicles enlarged ; c, out- 
line of cell and lamellae ; d, vertical section natural size ; e, transverse section, 
enlarged;/, the same, showing natural size. — Tahiti, and also the Feejee 
Islands, and Wake’s Island, Pacific Ocean. — Exp. Exp. 
8. A. Orbicella hyades {Dana). — Convex, erect glomerate and gibbous; 
polyps scarcely 2 lines broad, with 24 internal lamellae. Corallum light cellu- 
lar ; cells circular, 1^ lines broad, with the margin annulate as in the pleiades; 
lamellae very thin ; interstices narrow, mostly concave: in a transverse sec- 
tion, stars with 24 rays, septa spongy cellular. 
Plate 10, fig. 15, transverse view, natural size. — West Indies. — Dost. Soc, 
JVat. Hist. 
9. A. Orbicella excelsa (Dana).— Erect glomerate and gibbous, 5 inches 
high and 2 broad ; polyps small (scarcely 2 lines broad), with 24 internal 
lamellae. Corallum firm; cells circular, scarcely li lines broad; margin a 
little prominent, with 24 subequal denticulate lamellae ; interstices usually h a 
line broad : in a transverse section, stars about 24-ray ed ; septa sparingly cel- 
lular, cellules sometimes uniseriate. 
Plate 10, fig. 16, transverse view, natural size. — West Indies. — Dost. Soc. , 
JVat. Hist. 
10. A. Orbicella pleiades (D/Zis). — C onvex; polyps lines broad, with i 
24 internal lamellae. Corallum very light and delicately cellular ; cells orbic- • 
ulate, nearly li lines broad, margin annular and very thin ; interstices con- 
cave, loose cellular, narrow (about ^ of a line) : in a transverse section, lamellae i! 
12, very thin, the intermediate obsolete. 
Plate 10, fig. 5a, transverse section, natural size; 5b, same enlarged; 5c, ,i 
vertical section, natural size. — East Indies, Ellis, Lamarck. — Wake’s Island, , 
Pacific Ocean, Exp. Exp. 
11. A. Orbicella annularis {Lamarck). — Polyps small (1| lines broad), ), 
with 24 internal lamellae. Corallum cellular; cells orbiculate, scarcely over a i 
line broad, 10 to 12 slender rays, and others intermediate obsolete; interstices 
plano-concave : in a transverse section, septa cellular, with the cellules minute, 
usually in a single medial series, rarely in two series. 
Plate 10, fig. 6, transverse section of corallum, natural size. — West Indies. 
— Ellis, Lamarck. 
12. A. Orbicella stelldlata {Ellis). — Convex and often undulate ; polyps 
lines broad, disks sometimes budding and dichastic ; 24 internal lamellre. 
Corallum subcellular; cells orbiculate, 1 line broad, rarely oblong : lamellae 
