TRIBE I. ASTR.EACEA. 
31 
Plate 12, fig. 1, natural size ; 1 a, vertical section of corallum and cells, with 
profile of lamellae, natural size ; 1 &, transverse section.— Feejee Islands. — • 
Exp. Exp. 
30. Astr^a fragilis {Dana). — Subglobose, polyps 4 to 5 lines broad. 
Corallum light cellular; cells circular or oblong, deep, short coronate within; 
ridges rounded, slightly sulcate, a line wide ; lamellae even, finely and neatly 
denticulate, very thin: in a transverse section, stars many-rayed, with the cel- 
lules sparingly decompound ; septa f of a line thick, fragile cellular, cellules 
usually uniseriate. 
Plate 12, fig. 2a, profile of cell, ridges and lamellae, natural size; 2&, same 
enlarged; 2 c, vertical section of corallum, natural size; 2rf, transverse section 
of the same. — East Indies. — Exp. Exp. 
31. Astr^a tenella {Dana). — Hemispherical; polyps 3 to 5 lines broad. 
Corallum very light cellular; calicles polygonal often oblong; in a transverse 
section, stars very slenderly 14 to IG rayed, with large radiate cellules around 
the porous centre, and at the margin other small cellules in one or two series; 
septa delicately filiform. 
Plate 13, fig. 1, transverse section of corallum, slightly enlarged (about a 
sixth); 1 6, vertical section of same, natural size. — Wake’s Island, Pacific 
Ocean. — Exp. Exp. 
32. Astr^a magnifica {Blainville). — Convex, subhemispherical. Coral- 
lum light, cellular; cells often elongated and a little flexuous, 2 to 3 lines 
broad and sometimes 8 long ; angular, deep, short coronate within ; ridges 
narrow, scarcely a line thick, entire, obtuse, perpendicular; lamellae neatly 
even, finely and elegantly pectinato-denticulate : in a transverse section, stars 
many-rayed, with the cellules much decompound ; septa | a line thick, with 
large cellules in a single series. 
Plate 12, fig. 3a, outline view of cells; 3 6, transverse section of corallum, 
natural size ; 3 c, vertical section of same. — East Indies. — Exp. Exp. 
33. Astr^a filicosa {Dana). — Corallum quite cellular, yet firm; cells 
very deep, 5 to 8 lines broad, suborbiculate, perpendicular ; ridges and lamellae 
narrow : in a transverse section, stars multiradiate, lamellae stout, cellules de- 
compound; septa somewhat cellular, cellules oblong, mostly in a single inter- 
rupted series. 
Plate 12, fig. 4, cells of a worn corallum, natural size ; 4 a, transverse sec- 
tion of corallum, natural size; 4 6, vertical section of same. — Wake’s Island, 
Pacific Ocean. — Exp. Exp. 
34. Astra:a ve rsipo ra (Zramarc/c). — Subglobose. Corallum cellular, firm, 
surface rough ; cells deeper than broad, subangular, and often oblong (4 to 6 
lines), subcoronate within; ridges sulcate; lamellae unequal and unequally 
exsert, roughly denticulate, narrow, vertical. 
