52 
TRIBE I.—ASTR^ACEA. 
lum with the oririmes remote, large ; lamellae thin and delicate, not crowded, 
denticulate; under surface striate. 
East Indies. — Esper, 
III. Bifacial, folia crispate. 
5. Pavonia cactus [Ehrenherg), — Erect and lobed, lobes foliaceous, cris- 
pate, with the margin rounded, crenulate, often excised ; polyps green, tenta- ! 
cles obsolete. Corallum with the oririmes half a line broad, series united by 
a slight trench, subcoricentric, separated by ridges not quite obsolete ; lamellae 
minute, arenoso-asperate, obsoletely denticulate. 
Red Sea. — Ehrenherg. 
6. Pavonia prjEtorta {Dana). — Cespitoso-hemispherical ; folia bifacial, , 
delicate, and lobato-subdivided, every where strongly crispate and contorted, j 
Corallum with the folia quite thin, (below, 1 to li lines,) at the margin, nearly 
like paper in thickness; oririmes minute (scarcely a line), mostly in imper-|j 
feet transverse series, with the interstices scarcely at all convex; lamell®!; 
very delicate and crowded, the alternate but little smaller. |,; 
Plate 22, fig. 5, part of a clump, natural size ; 
Tahiti, Society Islands. — Exp. Exp. 
7. Pavonia Formosa [Dana ). — Cespitoso-hemispherical; folia thiin, bifa-|i| 
cial, lobato-subdivided, curved and broadly suberispate. Corallum with the f j 
folia thin, (below, to 2 lines thick,) at the margin usually acute ; oririmes i a ,, 
line long, often transversely seriate, with the interstices a little convex, and 1 ; 
to H lines broad ; lamellse very delicate, much crowded, the alternate scarcely "' 
smaller. '[ 
Plate 24, fig. 2, part of a hemispherical clump, natural size. — Tahiti, So- ( 
ciety Islands. — Exp. Exp. 
8. Pavonia venusta [Dana). — Cespitoso-hemispherical ; folia thin, bifa- 
cial, lobato-subdivided, curved and strongly crispate. Coralla with the folia 
thinner than in the formosa ; oririmes quite small, often exceeding a little half; 
a line ; interstices throughout flat, often 2i lines in breadth ; lamellse very 
delicate, the alternate much smaller. 
9. Pavonia divaricata {Lamarck). — Cespitose, piano-hemispherical; folia 
bifacial, very much subdivided, lobes carinato-angular, and flexuoso-divaricate, ;(■ 
crowded and stout, ^ to ^ an inch broad. Corallum with the lamellae rather ' 
crowded, oririmes often a line long. 
Plate 22, fig. 6, natural size. — Indian Ocean, Lamarck . — Feejee Islands, 
Exp. Exp. 
10. Pavonia boletiformis {Lamarck). — Subhemispherical ; folia bifacial, 
thin, undulate or somewhat crispate, lobed, lobes rarely exceeding an inch in ^ 
5 a, a separate folium. — 
