TRIBE I. ASTR^ACEA. 
21 
most part coalescing’. Corallum with the ridges generally duplicate, broad 
and strongly concave ; fossas i of an inch deep, lamellae a little dilated at base. 
Plate 9, fig. 3, profile vertical section, natural size. — West Indies. 
4. Manicina meandrites [Esper.) Ehrenherg . — Short turbinate, convex, 
aggregate; gyri sinuous, and of nearly uniform width, f of an inch broad. 
Corallum with the fossae and ridges triangular, the latter nearly subacute, and 
usually sulcate. 
West Indies. 
5. Manicina hispida [Ehrenherg ). — Very short, turbinate, and semiglo- 
bose ; gyri sinuous f to | of an inch broad. Corallum with the ridges J to ^ of 
an inch wide, every where truncate and concave ; lamellse abruptly inclined, 
dilatate at base, laterally hispid ; septa perpendicular. 
West Indies. 
6. Manicina prasrupta [Ehrenherg). — Turbinato-globose ; gyri about % of 
an inch broad. Corallum sparingly dilated at base; ridges nearly perpendic- 
ular, and mostly entire ; lamellp subtruncate at apex, lateral surfaces arenose ; 
fossB 4 to 5 lines deep, 2 to 4 lines broad. 
West Indies. — Ehrenherg. 
Genus Y.— TKIDACOPHYLLIA.— Blainville. 
Aggregate Astrseidse; animals quite broad, with the sides ex- 
panded explanate, and assurgent; tentacles minute. Coralla 
substipitate ; septa thin foliaceous, lamello-striate, enclosing 
broad cells, and often having on the lateral surface a few ori- 
rimes similar to those of the Pavonioe. 
1. Tridacophyllia lactuca [Pallas,) Blainville — Subhemispherical. Co- 
rallum, with very thin foliaceous septa, often 3 to 4 inches high, very deeply 
laciniate, and fragile ; cells large and deep, with a few lateral oririmes ; 
lamellae very narrow, sub-denticulate, granulous, becoming obsolete near the 
upper margin of the folia ; under surface remotely striate. 
Plate 9, fig. 10. — East Indies. — Exp. Exp. West Indies (?) — Pallas, Ellis. 
2. Tridacophyllia paeonia [Dana). — Convex; disk brown, i to 1 inch 
broad, rugate, exterior to the tentacles grayish-green ; tentacles minute. Co- 
rallum with the foliaceous septa less thin and large than in the lactuca, about 
2 inches high ; cells usually 1 inch broad, very rarely with lateral oririmes ; 
lamellsB numerous, and not becoming obsolete at the margin above, somewhat 
granulous ; under surface with more crowded striae than in the lactuca. 
Plate 9, fig. 11, natural size; 11a, section of corallum, with outline of 
lamellae. — The Feejee Islands. — Exp. Exp. 
