TRIBE in. MADREPORACEA. 
95 
12. Manopora grandifolia {Dana). — Thin, foliaceous (1^ lines thick), 
nearly erect, broad, and snbflabellate ; margin sparingly lobed; exterior alive 
for five of six inches from the edge ; tentacles flattened, short, yellowish ; disk 
pale ash-color, and marked with 12 white radiating lines. Corallum fragile, 
spinuloso-asperate, and resembling that of the expansa ; cells minute (i of a 
line), often imperfectly obvallate ; outer surface covered crovvdedly \vith very 
short obsolescent calicles, having acute margins. 
Plate 45, fig. 1, natural size; la, the animal enlarged; la', natural size 
of the same ; 1 b, upper and under surface of the corallum, natural size ; 1 c, 
upper surface, magnified; Id, part of a transverse section of the corallum, 
magnified twelve diameters. — Singapore, East Indies. — Exp. Exp. 
13. Manopora f.ffusa {Dana). — Explanately incrusting, margin free for 
a short distance; often covering growing Serpulas, and thus become ramose, 
with the branches tortuous, cylindrical, f of an inch thick. Corallum papilloso- 
asperate, spinules to 1 line long, some compressed, and for very short dis- 
tances confluent; cells ^ of a line broad; 12-rayed. 
Plate 4G, fig. 4, corallum, natural size; 4a, view of surface, ditto. — Tahiti, 
Society Islands. — Exp. Exp. 
14. Manopora stilosa {H. Sf Ehrenherg,) Dana. — Spreading glomerate, 
incrusting, reddish, surface convex and tuberculous; polyps bright violet, or 
verging towards red, disk marked with 12 white and violet lines, tentacles 12, 
papilliform, minute. Corallum asperate ; cells minute Q- a line), immersed, 
surrounded by rough minute lamellee, interstices setose, setae slender, rough, 
obtuse, subequal, lamellate about the cells. 
Red Sea. — Ehrenherg. 
15. Manopora venosa {H. ^ Ehrenherg,) Dana. — Spreading, glomerate, 
gibbous. Corallum rough with extremely minute points; ceils quite large (1 
line broad), with callous margins, vvhich are reticulately united and uneven, 
giving a venose appearance to the surface ; stars distinctly 12-rayed. 
16. Manopora nodosa {Dana). — Incrusting, glomerate ; surface tubercu- 
lous, with the tubercles subconical ; polyps pale lilac, tentacles obsolete, disk 
with 12 short crenations and a white margin. Corallum hardly fragile, spinu- 
loso-asperate ; spinules very much crowded, scarcely i a line long, a little 
compressed and obtuse; cells minute (one-fifth of a line broad), 6-rayed. 
Plate 46, fig. 2, zoophyte, natural size; 2a, part of surface and polyps, en- 
larged; 2 6, surface of corallum and cells, enlarged; 2c, transverse section, 
enlarged.— Fecjee Islands at Mathuata, Island of Venua Eehn.—Exp. Exp. 
17. Manopora scabricula (Z>a?ra).— Incrusting, glomerate, gibbous, with 
the tubercles of the surface rounded; polyps olive-green, tentacles obsolete; 
disk 12-rayed, with 6 alternate rays larger, and most prominent. Corallum 
