90 
TlilBE III. MADREPORACEA. 
54. Madrepora prolifera [Lamarck). — Arborescent, shrubby, spreading 
ramose, branches long, terete, a little arcuate, to f of an inch thick, (below 
rarely ] inch), proliferous above, and the branchlets often in a plane. Coral- 
lum scabrous; apical calicle very stout (nearly 2 lines), and exsert; the lateral 
subequal, crowded, long-nariform, but little compressed, mostly 1^ lines long, 
neatly striated, aperture nearly circular. | 
West Indies. | 
55. Madrepora nobilis (Dana). — Shrubby arborescent, very large, spread- | 
ing ramose, subproliferous ; branches stout (often 1 inch thick), divaricate, l ^ 
terete, summit branchlets to 1 inch in diameter, conical at apex. Corallum | I 
scabrous; apical calicles large (1| lines broad), scarcely exsert; the lateral . 
much crowded, nearly erect, hardly stout, mostly H lines long, (with others | 
obsolescent), dimidiate, not compressed, margin scarcely thick, striate, rarely 
proliferous; star six-rayed and very distinct, two of the lamella the most ^ 
prominent. • 
Plate 40, fig. 3, branch of corallum, natural size; 3«, extremity of branch. 
—East Indies, Singapore. — Erp. Erp. X 
56. Madrepora secdnda (Dana). Arborescent, spreading, ramose ; J 
branches numerous, terete, h to f of an inch thick; summit branchlets of an 4 I 
inch thick, gradually tapering. Corallum scabrous ; apical calicle nearly a || 
line broad ; the lateral, rather crowded, equal, nariform, and dimidiate, and ( 
very much compressed, hardly stout, 1 to 14 lines long, obsolescent on the in- i - 
ferior side of the branches; margin not incrassate ; aperture oblong; star ; '■ 
distinct, two of the lamellae quite prominent. " 
Plate 40, fig. 4, part of corallum, natural size; 4a, extremity of branch ; ’ 
4 6, profile of calicle. — Singapore, East Indies. — Exp. Exp. 
57. Madrepora gracilis (Dana). Arborescent, spreading ramose ; • 
branches slender, neatly terete, 3 to 5 lines thick, arcuate, gradually attenuate. , , 
Corallum smooth; apical calicle a line long and broad; the lateral equal, , 
rather crowded, stout, compressed-nariform, small (1 line long) ; aperture nar- " ; 
row, star distinct, and two of the lamellse most prominent. 
Plate 41, fig- 3, part of corallum, natural size; 3a, extremity of branch ; ; 
3 6, calicle, natural size. — The Feejee Islands and Sooloo Sea. — Exp. Exp. f ■ 
58. BIadrepora humilis (Dana). — Low fruticose, spreading and short : ■ 
ramose, stout, subproliferous ; branches terete, obtuse, mearly i an inch thick, 'r ^ 
Corallum having the apical calicle very stout (often 2 lines broad), scarcely ■ ! 
exsert; the lateral equal and even, somewhat crowded, very stout, neat nari- j 
form; aperture oblong; star scarcely distinct, two of the lamellae most promi- ! 
nent, and nearly meeting below. ' J 
Plate 41, fig. 4, corallum, natural size; 4a, profile of calicle; plate 31, fig. 
4 a, h, c, views of calicles, enlarged. — Feejee Islands.— Exp. 
