34 
TRIBE I. ASTR^ACEA. 
Plate 13, %. 2, cells of corallum, natural size; 2«, 2h, sections of cells ; 
2 c, transverse section of corallum, natural size ; 2 d, vertical section of same^ 
natural size. — Feejee Islands. — Exp. Exp. 
46. Astraca eximia (Dana). — Convex. Corallum cellular, firm ; cells 
very neatly polygonal, mostly about 2 lines broad, rather deep, coronate with- 
in ; ridges about half a line wide, abrupt, acute, lamella very narrow, sub- 
entire, not at all exsert : in a transverse section, septa scarcely ^ a line thick, 
solid, stars many-rayed, with simple, deep, cellules. 
Plate 13, fig. 4 a, section of cells and ridges, showing profile of lamellse ; 
4 6, size and form of cells ; 4 c, transverse section of corallum, natural size ; 
4 d, vertical section, natural size. — Pacific Ocean. — Exp. Exp. 
47. AstrjEA sindosa — Convex. Corallum subcellular ; cells sub- 
angular, hardly 2 lines broad, sometimes lobed and flexuous and 6 lines long, 
rather deep, crowdedly coronate within, ridges rounded, 1 to li lines thick, 
abrupt, entire ; lamellae even, subentire : in a transverse section, stars scarcely 
many-rayed, with the cellules simple ; septa ^ a line thick and nearly solid. 
Plate 13, fig. 5, cells of corallum, natural size; 5a, section of cells and 
ridges, showing profile of lamellae, natural size ; 5 b, transverse section of co- 
rallum; 5 c, vertical section of same. — Feejee Islands. — Exp. Exp. 
48. AsTRiEA MELicERUM {Ehreuberg). — Effuse, 3 lines high, allied to the 
pentagona, Corallum with the cells 2i lines broad, columella none, interstices 
a little broader, subtruncate. 
49. Astr^a parvistella {Dana). — Convex. Corallum cellular; cells 
angular, a line broad, rarely oblong, shallow, distinctly coronate within ; ridges 
scarcely ^ a line thick, rounded ; lamellae minute, even : in a transverse sec- 
tion, stars scarcely many-rayed, with the cellules simple; septa nearly solid, 
scarcely i of a line thick: texture below the cells coarsely cellular, 
Plate 13, fig. 6, cells of corallum, natural size; Qa, transverse section of 
corallum, enlarged ; 6 b, same, natural size ; 6 c, vertical section, natural size. 
■ — Feejee Islands. — Exp. Exp. 
50. AstrjEA favulus {Dana). — Convex. Corallum somewhat cellular, 
ceils 1 line broad, angular, occasionally 3 lines long, rather deep, obsoletely 
coronate within ; ridges scarcely a line thick. Gothic, or rounded, abrupt, en- 
tire ; lamellae nearly equal, subentire : in a transverse section, stars scarcely 
many-rayed, with the cellules simple ; septa scarcely ^ a line thick, nearly 
solid, with occasional minute cellules: texture below the cells very minutely 
cellular. 
Plate 13, fig. 7, cells of corallum, natural size ; 7 a, section of cells and 
ridges, showing also profile of lamellm ; 7 b, transverse section of coralliun, 
natural size; 7c, vertical section of the sa.me. — Feejee Islands.— Exp. 
