TRIBE I. ASTR^ACEA. 
19 
with a convex apex coarsely toothed, teeth subtriangular, large and small 
lamelte alternate. 
Plate 8, fig. 2, the animal not fully expanded ;2 a, 2 b, profile of lamellse. — 
Feejee Islands. — Exp. Exp. 
10. Mussa CEREBRJFORivirs {Dana). — Very large, hemispherical ; disks 
very long, linear, and sinuous. Corallum meandering ; cells | of an inch 
broad and very long, the lobes often straight and a foot long ; at bottom of 
cell one or two longitudinal lamellae ; lamellae rather thin, scarcely rounded 
above, dentate. 
Plate 8, figure 3, transverse section ; 3 a, 3 6, profile of lamellae and cell. — 
Feejee Islands. — Exp. Exp. 
11. Mussa regalis [Dana). — Subhemispherical, polyps large, often later- 
ally coalescing, disks forming long sinuous lines. Corallum meandrine, calicles 
1 to H inches broad, sometimes i of an inch apart, but often coalescing; ex- 
terior striate, not echinate ; cells very deep (often 1 inch), sometimes 6 inches 
long ; lamellae unequal, dentate, nearly h an inch exsert. 
Plate 8, fig. 5, section of cell, showing outline of lamellae and cells. — East 
Indies. 
III. Aggregate, meandrine. 
12. Mussa crispa [Lamarck.,) Dana. Stipitate, explanato-glomerate, 
spreading, convex ; disks linear and sinuous. Corallum with the margin thin, 
crispate, sublobate ; below, striate, plicate, and sparingly spinulous ; above, 
with sinuous gyri near f of an inch broad (rarely 1 inch), dilating at the 
border of the corallum; ridges | to f of an inch broad ; lamellae stout, unequal, 
strongly serrate. 
Plate 8, fig. 6, view of the lamellae. — Indian Ocean, Lamarck. — Singapore, 
Exp. Exp. 
13. Mussa dipsacea [Dana). — Very short, turbinate, convex, disks short, 
linear, and almost simple. Corallum very firm ; cells i to f of an inch broad 
and f to 2 inches long, often lobed ; lamellae quite stout, slenderly and neatly 
dentate, 1 line exsert, alternately smaller ; ridges sometimes obsoletely sul- 
cate, septa very thin (i to 1 line), solid. 
Plate 8, fig. 9, section of cell, showing outline of lamellae. 
14. Mussa fragflis [Dana). — Glomerate, scarcely stipitate or partly in- 
crusting, convex. Corallum fragile ; below, strongly and acutely lamello- 
striate ; above, gyri i to f of an inch broad, dilating at the margin of the 
corallum ; ridges 4 to 5 lines broad, rounded and somewhat sulcate ; septum 
of an inch thick, and at top two longitudinal calcareous lines one-tenth of an 
inch apart ; lamell<e fragile, dentate, with the teeth slender, at apex denticu- 
late. 
