TRIBE I. ASTRiEACEA. 
41 
Plate 15, fig. 2, cells and ridges, enlarged ; 2 a, lamellae of surface, enlarged. 
—East Indies. — Exp. Exp. 
2. Merulina regalis (Z?ana).— Broad explanate, unifacial, variously lobed 
and plicate, and forming a broad open hemispherical clump ; folia 3 to 6 inches 
broad ; umber-colored, disks greenish, tentacles minute, forming a series along 
the margin of the disk. Corallum with the ridges narrow, nearly 1 line high ; 
lamellae lax. 
Plate 15, fig. 1, outline sketch of part of the corallum, natural size ; 1 a, 
part of the live zoophyte ; 1 6, enlarged view, showing the tentacles ; 1 c, view 
of the cells and the ridges enlarged; Id, 1 e, lamellae enlarged. — Feejee 
Islands. — Exp. Exp. 
3. Merulina. speciosa {Dana ). — Very thin explanate, unifacial ; folia ag- 
gregated, and crowdedly implicate, 1-3 inches broad, very much crispate, 
often crenato-lobate. Corallum with the ridges ^ a line high, sometimes ob- 
solete, lamellae minute and crowded. 
Plate 16, fig. 1, part of corallum, natural size. — Feejee Islands. — Exp. Exp. 
4. Merulina crispa {Dana). — Very thin explanate ; folia crispate and 
every where coalescing, small, sublaciniate, the inner bifacial. Corallum 
with the ridges and lamellae lax, uneven, and very rough. 
Sooloo Sea, East Indies. — Exp. Exp. 
5. Merulina folium {Lamarck,) Dana . — Thin explanate, somewhat con- 
cave, with broad rounded lobes. Corallum below, faint radiato-striate ; above, 
the surface covered with unequal cones, diminishing and obsolescent at the 
margin. 
East Indies. — Lamarck. 
II. Ramose Merulince. 
6. Merulina scabricula {Dana). — Ramose, branches subdivaricate, often 
coalescing, ^ of an inch thick; color yellowish-umber, greenish; tentacles 
minute. Corallum with the branches subangular, and obsoletely compressed, 
truncate at apex, lamellas crowded, and not becoming more lax at apex, trans- 
verse, even, scabrosely serrulate ; ridges short, oblique, obtuse. 
Plate .16, fig. 2, view of corallum; 2«, view of the animals, enlarged; 26, 
transverse section of branch, enlarged. — Feejee Islands. — Exp. Exp. 
7. Merulina laxa {Dana). — Ramose, branches divaricate, often coales- 
cent, with the branches angular, often alate and compressed, li to 3 lines 
thick, sometimes ^ an inch broad and subpalmate ; ridges small, acute, some- 
times elongato-conical ; lamellae lax, very oblique and ascending, much more 
lax at apex. 
Plate 16, fig. 3, corallum, natural size. — Sooloo Sea, East Indies. — Exp. Exp. 
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