38 
TRIBE I. ASTR^ACEA. 
cellular at middle, subacute, nearly triangular, of an inch high, and thick 
at base ; lamellae quite thin. ! 
Plate 14, fig. 11 n, worn surface, natural size; 116, outline of fossae, do. ! 
8. Meandrina VEP.YGi a {Ellis,) Lamarck. — Subhemispherical ; linear disks 
long, straight or flexuous in different parts ; gyri 2 to 2i lines broad. Coral- i 
lum cellular, firm; ridges nearly triangular; lamellae subacute, eroso-denticu- i 
late, remote, very unequal, the intermediate smaller lamellae obsolescent ; 
fossae triangular, lamello-linear at bottom, and not porous, Muth the longitudinal | : 
lamella interrupted and somewhat crispate: in a transverse section, septa i of ; 
a line thick. ■ 
Plate 14, fig. 8, surface of corallum, natural size; 8a, section of same, I 
showing profile of lamellae ; 8 6, vertical section. — East Indies. Ceylon. — 1 j 
Rev. G. A. Apthorp. I ^ 
9. Meandrina gracilis {Dana). — Convex; linear disks long, straight or | 
tortuous (as in i\iQ plirygia)', gyri nearly 2 lines broad. Corallum cellular, | j 
rather firm; ridges Gothic, abrupt, a line high; lamellae finely eroso-denticu- ,|i 
late, equal or nearly so, numerous, but little exsert ; fossae very narrow, la- |i, 
mello-linear at bottom and not porous: in a transverse section, septa f to 1 Ijj 
line broad, subcellular. |l! 
Plate 14, fig. 6, surface of corallum, natural size ; 6 a, section of same, show- || 
ing profile of lamellae; 66, transverse section of same, natural size. — Feejee |i 
Islands. — Exp. Exp. | 
10. Meandrina tenuis {Dana). — Subhemispherical ; linear disks tortuous, | 
of a green color ; tentacles small, brownish ; gyri li lines broad. Corallum | 
very cellular, rather light ; ridges Gothic, abrupt, a line high ; fossae very nar- | 
row, lamello-lineate at bottom instead of porous; lamellae numerous, even, |j 
finely denticulate : in a transverse section, septa hardly i of a line thick, se- || 
riately cellular. | 
Plate 12, fig. 7, enlarged view of part of the zoophyte; 7a, one of the ten- 11 
tacles enlarged ; 7 6, section of cells showing profile of lamellae, natural size ; || 
7 c, lamellae of same, enlarged ; 7 d, transverse section of corallum, natural | 
size. — Feejee Islands, Exp. Exp. — Tongatabu, Quay Gaymard. | 
11. Meandrina filograna {Esper,) Dana . — Convex or nearly flat; linear | 
disks subtortuous; gyri H lines broad. Corallum with the ridges rounded, i 
triangular, nearly a line high; lamellae very finely denticulate, and very much | 
crow'ded ; fossm repand, at bottom convolute-porous. ; 
Plate 14, fig. 9. — West Indies. '' 
6. Septa stout, and truncate at apex. ( \ 
12. Meandrina cerebriformis {Lamarck). — Hemispherical; linear disks 
very long and tortuous ; gyri 5 lines broad. Corallum cellular, firm ; ridges 3 t 
