32 
TRIBE I. ASTR.EACEA. 
Plate 12, fig. 5«, profile of cells, ridges and lamella3, natural size ; 5 b, trans- 
verse section of corallum, natural size. — -East Indies, Lamarck. — Red Sea, 
Ehrenhcrg, 
35. Astr^a DENTicuLATA (EWis). — Subglobose. Corallum cellular ; cells 
somewhat circular, half an inch wide, rather shallow, coronate within; ridges 
slightly sulcate ; lamellse unequal and unequally exsert, vertical, subtruncate 
at apex. 
Plate 12, fig, 6, outline view of a cell, natural size; 6a, profile of cell and 
lamellaB; 6&, transverse section of corallum, natural size ; 6 c, vertical section 
of the same. — East Indies. — Pacific Ocean. — Eap. Exp. 
36. Astr^a pectinata [H. Ehrenherg). — Subglobose; brown. Coral- 
lum with the cells 3 to 6 lines long, often oblong and flexuous, deep, coronate 
within ; ridges scarcely sulcate ; lamellae with the inner margin vertical, trun- 
cate at apex, rough. 
Red Sea. — Ehrenherg. 
37. Astrjea deformis (LamarcA:).— “Subglobose. Corallum with the cells 
4 to 6 lines long, angular, sometimes oblong and irregular; ridges narrow, 
entire ; lamellae alternate, asperate, truncate, exsert. 
Indian Ocean ? Lamarck. — Red Sea, Ehrenherg. 
38. Astr^a varia {Dana). — Hemispherical, polyps mostly 3 lines broad, 
disks sometimes 2 or 3 mouthed. Corallum light cellular ; cells angular, deep 
or rather so, ridges and lamellae triangular and nearly acute above ; lamellae 
thin, unequal and unequally exsert, fine denticulate ; septa scarcely half a 
line thick. 
Plate 12, figs. 13 a, 13 6, sections of cells of different varieties, giving profile 
of lamellae. — West Indies. 
39. Astr^a rigida {Dana). — Subglobose; polyps 6 to 10 lines broad. 
Corallum firm ; cells angular, 5 lines broad, and sometimes 8 to 10 long, often 
lobed, not coronate within; ridges thin, entire, and naked at summit; lamellae 
dentate, very unequal, not crowded : in a transverse section, septa solid or 
with rarely a cellule, a line broad; stars hardly many-rayed, cellules large, 
and sparingly decompound. 
Plate 12, fig. 8a,-section of cell and ridges, showing profile of lamellae, nat- 
ural size ; 8 6, a cell bisected ; 8 c, size and form of cells on surface of coral- 
lum ; Sd, transverse section, natural size. — West Indies. 
40. Astrtea reticularis {Lamarck). — Subglobose. Corallum with the 
cells angular, often oblong and subflexuous, deep, radiate from the centre ; 
ridges nearly naked, smooth at apex. 
Plate 12, fig. 9 a, section of cells and ridges, with the lamellae, natural size ; 
9 6, size and form of cells ; 9 c, transverse section of corallum. — West Indies ? 
