TRIBE I. ASTR^ACEA. 
27 
thin, a little prominent above the septum, and evenly so ; interstices usually 
concave, yet often entire : in a transverse section, septa solid or nearly so, 
sometimes with cellules interruptedly uniseriate, and occasionally biseriate; 
stars 10 to 12-rayed, other intermediate rays obsolete. 
Plate 1 0, fig-. 7 a, transverse section, natural size ; b, vertical section, do. — ■ 
West Indies. 
13. A. Orbicella stelligera {Dana). — Convex and subgibbous ; polyps 
li lines broad, disks rarely budding and dichastic ; 18 internal lamellse. Co- 
rallum subcellular; cells quite small (f of a line broad), neatly orbiculate, 
sometimes oblong and dichastic, rather shallow, within minutely coronate ; in- 
terstices concave ; lamellae slightly prominent, neatly radiating upon the sep- 
tum around the cell, abrupt within ; in a transverse section, the septa nearly 
solid, stars few-rayed (6 to 8 larger). 
Plate 10, fig. 9, surface of corallum, natural size ; 9 a, profile of cell and 
lamellae; &, lamella enlarged ; c, vertical section, natural size; rf, transverse 
do.; 9e, transverse section enlarged, — Feejee Islands. — Eip. Eip. 
14. A. Orbicella (.^) crispata {Lamarck). — Corallum incrusting; cells 
nearly circular, infundibuliform, separated along the ridge, multilamellate ; 
lamellae denticulate. 
Indian Ocean. — Peron and Lesueur. 
15. A. Orbicella microphthalma {Lamarck). — Glomerate; greenish fus- 
cous; tentacles whitish, minute; polyps a little prominent, 1 to I ^ lines broad; 
lamellae 24. Corallum subcellular, having short globoso-cylindrical calicles, 
granulato-striate without, often contiguous ; cells f of a line broad, rather 
1 deep ; lamellae minute, usually about 12 somewhat exsert, and 6 a little the 
I most so ; interstices very finely granulous : in a transverse section, the septa 
[ with few cellules, stars irregularly few-rayed. 
Plate 10, fig. 11, surface of corallum, natural size; 11 a, animal enlarged; 
116, calicle enlarged ; 11 c, vertical section enlarged ; 1 1 (/, same, natural size ; 
lid, transverse section, natural size; lie, same, enlarged. — New Holland 
Seas, Peron and Lesueur. — Feejee Islands, Exp. Ejp. 
I 16. A. Orbicella ocellina {Dana). — Glomerate and lobed, often incrust- 
! ing; polyps scarcely exceeding a line in breadth, lamellae 24. Corallum with 
1 the calicles globoso-cylindrical, as in the microphthalma, but smaller, with 12 
I minute lamellae equally exsert; interstices nearly naked; cell deep; in a 
I transverse section, septa nearly solid, and stars few-rayed. 
Plate 10, fig. 10.— Sandwich Islands. 
