36 
TRIBE I.-— ASTR^ACEA. 
57. AsTRiEA HELiopoRA [Lamarck). — Planulate. Corallum with the cells f 
circular, rather large, many-rayed, the lamelles separated along the ridges be- 
tween the cells, incrassate above and without; centre papillose. ' 
The “ Austral Seas.” — Lamarck. 
58. AsTRiEA Hemprichii {Ehrenberg). — Corallum with the cells unequal, 
5 to 5^ lines broad, pentagonal or hexagonal, rather shallow; interstices 
acutely cristate ; lamellae strongly denticulate. 
The Red Sea. — Ehrenberg. 
59. Astr^a halicoha {Ehrenberg). — Globose. Corallum, with cells | 
lines broad, often pentagonal, somewhat shallow, lamellae of contiguous stars ; 
somewhat continuous, sometimes alternate, interstices none. 
The Red Sea. 
60. Astrjea cyclastra {Dana). — Flexuoso-convex, polyps 3 to 5 lines | 
broad. Corallum cellular, cells circular, margin a little prominent and ridges i 
usually sulcate: in a transverse section, stars many-rayed (24-30), rays thin, ! 
with the cellules sparingly decompound ; septa i to 1 line thick, cellular along ■ : 
the middle, cellules in 1 or 2 series. 
61. Astr^a favosa {Lamarck). — Subglobose. Corallum with the cells 
rather large, unequal, angular, margin subacute, sides lamellose, lamellae 
dentate. ; 
East Indies, 
Genus YIIl. — MEANDRUSTA.— Lamarck, 
Aggregate Astraeidas ; disks seriate! y budding and remotely 
or not dichastic, and hence linear, sinuous ; tentacles forming a 
series along either margin of the linear disk. Coralla, with 
trench-like, gyrose, cells; lamellae thin, prolonged out of the 
cell to the middle of the septum or beyond. (Gyri not exceed- 
ing half an inch in breadth.) 
A. CONVEX, HEMISPHERICAL, NOT GIBBOUS OR LOBATO-RAMOSE. 
a. Septa at apex subacute or acute. 
I. Gyri short. 
1. Meandrina dedalea {Ellis). — Hemispherical ; with the submeandering 
disks short, seldom over an inch long ; gyri 3 lines broad. Corallum with the 
fossse 3 lines deep, ridges acute-triangular; lamellse much unequal and une- 
qually exsert, eroso-denticulate ; septa scarcely h a line thick at base. 
