INTRODUCTION. XXX1X 
Section IV.— ASTREINA) AGGREGAT A. 
Corallum composite, massive, increasing by gemmation or by fissiparity, and in that 
case not presenting a linear mode of arrangement of the corallites, which are always com- 
pletely united laterally, but remain well defined, and never lose their individuality, as in 
the confluent Astreina. 
57. Genus ASTREA. 
(In parte) Lamarck, Syst. des Anim. sans Vert., p. 371, 1801; Milne Edw. and J. Haime, Comptes rend., 
t. xxvul, p. 494, 1848. 
Corallum massive, in general convex or sub-globose. Gemmation extra-calicular. Coral- 
. . 3 oO 5 . . 
lites tall. Calicules Naving a free, exsert, obtuse, circular margin; fossula not very deep. 
5 bet hon oT ? 4 
Columella spongy, and not projecting at the bottom of the calicule. No pal. Senta 
5 I 8 . ; d 
complete, exsert, broad, and strongly dentated or lobated ; the largest of their apical teeth 
near the columella; their sides strongly granulated. Coste highly developed, and com- 
posed of lamelle ; in general perforated, and united by numerous dissepiments. 
Typ. sp., Astrea cavernosa, Milne Edw. and J. Haime, loc. cit., vol. x, tab. ix, fig. 1; Madrepora 
cavernosa, Esper, Pflanz. Suppl. Mad., tab. xxxvii; Astrea argus, Lamarck, Hist. des Anim. sans Vert., 
t. x1, p. 259. 
58. Genus CYPHASTREA. 
Milne Edw. and J. Haime, Comptes rend. de l’Acad. des Sc., vol. xxvii, p. 494, 1848. 
Corallum massive, convex, and globose. Gemmation extra-calicular. Corallites united 
by a compact septal ccenenchyma, the surface of which is strongly granulated, or even 
echimulated. Calicular rims as in the preceding genus. Columella papillose, and well 
developed. Sepa lamellar near the wall, but cribriform towards the columella, where 
they are formed by a series of oblique processes, representing a sort of lattice; their 
calicular teeth rather larger towards the calice than near the walls. 
Typ. sp., Cyphastrea microphtholma, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3™ série, vol. x, 
tab. ix, fig. 5; Astrea microphthalma, Lamarck, op. cit. 
j 
59. Genus OULASTREA. 
Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 495, 1848. 
Corallum massive and incrustating. Gemmation extra-calicular. Corallites low. 
Calices circular, with a free margin. Co/wmella papillose, and appearing to be formed by 
the inner apical teeth of the septa. No pali. Septa with a crispate, denticulated, apical 
margin, and echinulate sides. Coste also echinulate and crispate. 
Typ. sp., Oulastrea crispata, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3™ serie, vol. x, tab. ix, 
fig. 4; Astrea crispata, Lamarck, Hist. des Anim. sans Vert., vol. ii, p. 265. 
