INTRODUCTION. lvii 
Second Tribe—MONTIPORIN Ah. 
Ceenenchyma abundant and spongy. 
9. Genus ALVEOPORA. 
Quoy and Gaimard, Voyage de l’ Astrolabe, Zooph., p. 240, 1833. 
Corallum arborescent. Canenchyma very porous and echinulate, but not bearing large 
excrescences. Margins of the calices scarcely distinct. Sepfa not numerous, and formed 
by series of spmiform processes. No columella. 
Typ. sp., Alveopora rubra, Quoy and Gaim., loc. cit., Zooph., tab. xix, figs. 11-14. 
10. Genus Montipora. 
Quoy and Gaimard, op. cit., p. 247, 1833; Manopora, Dana, Zooph., p. 489, 1846. 
Corallum of various forms, differmg from Alveopora by the existence of large projec- 
tions of the coeonenchyma between the calicules. Canenchyma much more abundant, and 
more delicately spongy. 
Typ. sp., Montipora verrucosa, Quoy and Gaim., op. cit., Zooph., pl. xx, fig. 11. 
ll. Genus PSAMMOCORA. 
Dana, Zooph., p. 344, 1846. 
Cenenchyma somewhat compact, of a fasciculate structure, and having its surface 
. . . . . ? . 
papillose. Calices very shallow, confluent, and without distinct walls. Seta thick, and 
formed by strong spiniform processes. 
Typ. sp., Psammocora obtusata, Dana, loc. cit., p. 345; Pavonia obtusangula, Lamarck, Hist. des 
An. sans Vert., t. 11, p. 240. 
Sub-order 3. 
ZOANTHARIA TABULATA. 
Corallum essentially composed of a well-developed mural system, and having the visceral 
chambers divided into a series of stories by complete transverse tabula or diaphragms. 
Septal apparatus rudimentary. 
The principal character of this sub-order is founded on the existence of the lamellar 
diaphragms that close the visceral chamber of the corallites at different heights, and differ 
from the dissepiments of the Astreidee by not being dependent on the septa, and forming 
as many complete horizontal divisions extending from side to side of the general cavity, 
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