TRIBE I. ASTR.EACEA. 
39 
lines broad, perpendicular, somewhat rounded and obtusely sulcate above ; 
septa i- of an inch thick at apex ; lamellae numerous, denticulate, thin: in a 
transverse section, septa subceliular. 
Plate 14, fig. 2, section of trenches and ridges, showing also profile of la- 
mellss.—Bermudas and West Indies, 
13. Meandrina truncata [Dana). — Hemispherical ; linear disks long 
and tortuous; gyri 4 to 5 lines broad. Corallum subceliular, firm; septa at 
apex truncate and full i of an inch thick, solid; fossae a little broader, nar- 
row-linear at bottom. 
Plate 14, fig. 3, section of cells and ridges of worn specimen, natural size; 
3 a, worn surface. 
B. Gibbous or cylindrical. 
14. Meandrina mammosa (Dana).— -Gibbous and coarsely mammillary, 
effuse; linear disks tortuous; gyri ^ of an inch broad. Corallum with the 
ridges triangular, subacute and nearly naked at apex ; septa stout and solid ; 
lamellae thin, subentire ; fossae 2 to 3 lines deep. 
Plate 14, fig. 10, section of trench and ridges ; 10 a, outline sketch of sur- 
face of corallum. 
15. Meandrina cylindrus (Dendrogyra cylindrus, Ehrenberg). — Cylindri- 
cal, erect. Corallum with the ridges convex, obtuse, often narrower than a 
line, 2 to 3 lines distant, lamellae stout, unequal, somewhat inflated, the alter- 
nate larger. 
16. Meandrina caudex (D, caudex, Ehrenberg).— ’Erect stout, cylindrical, 
Corallum with the ridges diiatate, flat, lamellae stout, few, a little prominent, 
the alternate larger, fosss a line broad. 
Genus IX.—MONTICULARIA.— Lamaeck. 
Aggregate Astraeidse; disks seriately and reticulately budding, 
and not dichastic, with no interstices between tbe polyps, but 
small cones, around wbicli tbe tentacles are arranged. Coralla 
cellular ; cells none, surface covered with small lamello-radiate 
cones. 
1. Monticularia microcona [Lamarck). Convex, subhemispherical ; 
disks ash-colored, tentacles numerous, pale brown. Corallum cellular; cone- 
lets small, nearly equal, usually obsoletely compressed ; lamellae finely ser- 
rulate. 
Plate 13, fig. 13a, enlarged view of the surface of the corallum; 13 6, en- 
larged view of the live zoophyte ; 13 c, transverse section of corallum, enlarged ; 
