20 
TRIBE I. ASTR^ACEA. 
Plate 8, fig. 7, outline of lamellee and transverse profile of trench.—West 
Indies, Bermudas. 
15. Mussa gyrosa {Ellis,) Dana. — Convex, glomerate, disks long and sinu- 
ous. Corallum with the gyri ^ to f of an inch broad, septa stout, at the centre 
nearly solid. — East Indies (?). — Esper. 
16. Mussa recta {Dana). — Glomerate, very large, disks very long, and 
often straight. Corallum with the gyri 1 inch broad ; septa stout, solid, scarcely 
cellular; lamellae unequal. 
Plate 8, fig. 11, worn fragment of the corallum ; 4 a, vertical section of the 
same. — Wake’s Island, Pacific Ocean. — Exp. Eip. 
17. Mussa nobilis {Dana). — Glomerate, subhemispherical or nearly plane ; 
disks long sinuous, green; mouth white; tentacles very short. Corallum, 
with the gyri 1-Li inches broad; lamellce unequal, spinoso-dentate, small and 
large alternating ; ridges entire. 
Plate 8, fig. 10, worn fragment of the corallum. — Port Carteret, New Ire- 
land, (^uoy ^ Gaymard. — Wake’s Island, Pacific, Exp. Exp. 
Genus IV. — MANICINA. — Eheenberg. 
Animals aggregate or segregate, and explanato-glomerate ; 
disks rarely simple, very commonly seriately budding, and be- 
coming long and sinuous. Coralla substipitate, convex; cells 
fossiform, meandering, with the margin rounded; lamellae even, 
thin, neatly and distinctly denticulate. 
1. Manicina amarantum {Dana ). — Segregato-gemmate, large, convex; 
disks sinuous. Corallum having the calicles meandrine; fossa 1 to l^ inches 
deep, usually perpendicular and i of an inch broad, but often dilating to 1 
inch towards the margin, at bottom very narrow and not porous ; ridges 
rounded, near 2 lines thick. 
Plate 9, fig. 1, part of a corallum, natural size. — East Indies. — Exp. Exp. 
2. Manicina fissa {Ehrenherg). — Stipitate, convex, mostly aggregate in 
structure ; disks sinuous. Corallum having the margin thin, lobate, broadly 
plicate ; ridges nearly i an inch broad, subtruncate and sulcate ; septa openly 
cellular, i of an inch thick, trenches very deep (often 1 inch), irregular, dilat- 
ing at the margin ; lamellae lax, foliaceous. 
West Indies (.^) 
3. Manicina areolata {Ellis,) Ehrenherg. — Short turbinate, sinuoso-pli- 
cate at margin, gyri i to f of an inch broad, sparingly sinuous, folds for the 
