TRIBE III. — -MADREPORACEA. 
93 
V. Cells immersed, situated at the bottom of deep circular pits ; surface of 
the coralla not verrucose or papillose. 
27. M. foveolata. 
VI. Cells superficial, immersed, surface of the coralla evenly smooth, zoo- 
phytes branched. 
28. M. digitata. 29. M. tortuosa. 
1. Manopora gemmulata. — Explanate, contorto-foliaceous, near a Gem- 
mipora in habit; folia clustered into a broad clump; thickness 1 to lines; 
calicles scattered, short subtubiform; cells very neatly 12-rayed, a little ellip- 
tical, the centre of the bottom a short thin line ; outer surface smooth and not 
wrinkled. 
2. Manopora lichen (Dana ). — Incrusting explanate, much contorted and 
uneven, often lobed, i of an inch thick. Corail urn having very short or obso- 
lescent tubiform calicles; cells G-rayed, with the intermediate rays sometimes 
distinct. 
Tahiti, Society Islands (?). — Exp. Exp. 
3. Manopora caliculata (Dana). — Glomerate, subgibbous, with a thick 
revolute margin. Corallum porous ; calicles subtubiform, often angular, 
crowded, f of a line broad, very short or obsolescent; cells J2-rayed. 
Plate 44, fig. 1, corallum, natural size. — Feejee Islands. — E.ip. E^p. 
4. Manopora palmata (Dana). — Small; ramose, often irregularly pal- 
mate, branches much compressed, rarely terete and close digitate, two or three 
lines thick ; polyps of a pale brown color, with the disk spotted, tentacles 
flattened, the alternate pale bluish or lilac, the others pale brov/n, with a whit- 
ish spot on the upper surface near the apex. Corallum fragile, papilloso-aspe- 
rate, cells numerous, 6 to 12-rayed. 
Plate 44, fig. 2, flabellate variety, natural size; 2 6, polyp, enlarged ; 2c, 
cells, showing also the surface, magnified 12 diameters; 2c?, surface of coral- 
lum, natural size; 2e, transverse section of a branch magnified 3 diameters; 
2 /, part of a transverse section, enlarged 12 diameters; fig. 2 or, another va- 
riety. — Feejee Islands. — Exp. Exp. 
5. Manopora compressa (Linn.) Dana. — Caulescent ramose, subdichoto- 
mous and lobate ; somewhat compressed. Corallum fragile, granuloso-aspe- 
rate ; cells everywhere a little prominent, scabrous, stellate, and generally 
with G rays. 
Mediterranean Sea.^ 
6. Manopora crista-galli (i7. ^ Ehj'enherg,) Dana. — Erect-subcespitose, 
inciso-lobate, compressed, angular and alate, lobes often cultrate. Corallum 
