54 
TRIBE I. — -ASTR^ACEA. 
17. Pavonia clavus {Dana ). — Erect cylindrical, 1 to 3 inches in diameter, 
sometimes a little compressed, rounded at apex, occasionally lobato-furcate ; 
tentacles obsolete, bright green. Corallum with the oririmes 1 to li lines 
distant, and smaller at apex ; lamellse entire. 
Plate 24, fig. 4, corallum, natural size ; 4 a, animal, enlarged ; 4 i, star of 
■corallum, magnified. — Feejee Islands. — Exp. Exp. 
Genus VIII.— AGARICIA.— Lamarck. 
Attached Fungid^, oblique or erect explanate, unifacial or 
bifacial ; polyps transversely seriate with the outer side promi- 
nent ; sometimes subseriate with the parts around each mouth 
elevated ; hence the mouths are arranged either at the bottom 
of transverse fossae or of cells. Coralla transversely or reticu- 
lately colliculate ; lamellm minute, subentire, crowded, alternately 
smaller. 
Subgenus I. — UNDARIA. 
Transversely colliculate ; no excavate cells in any part ; ori- 
rimes minute and arranged along the bottom of the fossae. 
1. Agaricia undata (Ellis,) Lamarck . — Very broad explanate, and often 
plano-subcucullate, scarcely lobed, margin thin and not revolute ; ridges long 
and rather even, mostly i of an inch broad, rotundato-triangular, becoming 
obsolete at the margin. 
Plate 21, fig. 8, surface of corallum, natural size. — West Indies. 
' ii 
jf’ 
2. Agaricia rugosa [Lamarck). — Broad explanate, stout, sparingly inciso- |i 
lobate, and sometimes wide subpalmate, margin strongly refiexed; ridges |; 
large, often interrupted and very unequal, 2 to 3 lines thick at base, with the Ij 
summits often much prolonged ; polyps reddish-brown, tentacles obsolete. I; 
Plate 22, fig. 1, part of cprallum, natural size ; 1 a, the animals enlarged ; 
1 h, longitudinal cross-section, enlarged ; 1 c, transverse, do. — “ Austral Seas,” |! 
Peron Lesueur. — Feejee Islands, Exp. Exp. |j 
3. Agaricia speciosa (Dana). — Cucullato-explanate ; subreniform, thin, || 
margin not reflexed ; ridges prominent, narrow (1 to 1^ lines), subtriangular, | 
nearly even. Corallum with the margin fragile, and under surface very finely |: 
striate. 
Plate 21, fig. 7, corallum, natural size.-— East Indies.— Exp. 
