94 
TRIBE III. MADREPORACEA. 
fragile, surface partly spinuloso-asperate, cells rarely bordered by papillae, 
very distinctly 6-rayed ; crests without cells. 
Plate 46, fig. I, part of corallum, natural size. — Red Sea, Ehrenherg. — Sin- 
gapore, Exp. Exp. 
7. Manopoua spumosa {Lamarck,) Dana. — Subcespitose, erect, gibboso- 
subramose, lobes short, stout, often tuberculato-gibbous, rarely angular, some- 
times subclavate at summit. Corallum fragile, crowdedly spinuloso-asperate, 
papilla) at apex much stouter than elsewhere and obtuse; cells imm.ersed, 
margin not tumid, star 6 to 1 2-ray ed. 
Plate 44, fig. 4, corallum, natural size. — Singapore, East Indies, Exp. Exp. 
— Red Sea, Ehrenherg. 
8. Manopora cjrcumvallata [H. Ehrenherg,) Dana. — Cespitose, half 
a foot high, irregularly ramulose, branchlets angular, irregular, lobato-ramu- 
lose, rounded at summit and not crested. Corallum having the cells unequal, 
crowded, bordered by a lobed (quadrilobate) margin, making it subinfundibu- , 
liform : interstices setuloso-asperate. 
Red Sea. — Ehrenherg. 
9. Manopora hispida (Dana). — Broad foliato-explanate at base, a little 
convex, with a somewhat lobed or undulated margin, and ^ of an inch thick; 
bearing above a few^ very stout erect stems, gibbously divided and tuberose, i 
never angular. Corallum fragile, every where densely spinuloso-asperate, 
even over the summits; spinules slender and fragile, aline long; cells im- 
mersed, i of a line broad, very distinctly 6-rayed; under surface of the coral- ^ 
lum naked. 
Plate 44, fig. 5, corallum, natural size. — Singapore, East Indies. — Exp. Exp. 
10. Manopora foi.iosa [Ehrenherg,) Dana. — Explanate, concave, either ; 
convoluted-foliate, or tuberculoso-subramose, usually crispate. Corallum po- 
rous, spinuloso-asperate; cells minute, unequal, surrounded by a prominent 
border, and sometimes subtubular; under surface plane and nearly even. 
The Red Sea. — Ehrenherg. 
li. Manopora expansa (Dana ). — Thin foliaceous, (H to 2 lines thick,) 
wide-spreading, and a little ascending, often broad dish-shape, sometimes in- 
crusting in part; margin a little undulate, scarcely plicate ; under surface alive 
for 2 inches from the edge ; tentacles white, tuberculiform. Corallum fragile, •;| 
spinuloso-asperate; cells minute (nearly J of a line broad): often imperfectly BJ 
obvallate ; below, a few distant, long (3 lines), tubiform calicles, close ap- 
pressed to the folium, and also a few scattered cells. | 
Plate 45, fig. 2, outline of a specimen, natural size; 2 cf, polyp, enlarged ; 
2a', natural size of the same; 2 6, part of a folium, showing the upper and 4; 
undersurfaces; 2 c, upper surface, with the cells magnified; 2d, transverse | 
section, magnified tw^elve diameters. — Singapore, East Indies. — Exp. Exp. i 
