INTRODUCTION. lv 
Family VII. 
PORITID. 
Corallum entirely composed of reticulate sclerenchyma. Septal apparatus well 
developed, but never lamellar, and composed only of series of styliform processes or 
trabicule, constituting by their junction a sort of irregular trellis. Malls presenting the 
same structure, and not distinct from the ccenenchyma. Visceral chamber containing 
some small dissepiments, but never divided by tabule. 
First Tribe—PORITIN &. 
Coenenchyma rudimentary, or not existing. 
1. Genus Porttss. 
(Pars) Lamarck, Hist. des An. sans Vert., t. 11, p. 267, 1816; Milne Edw. and J. Haime, Comptes rend., 
t. xxix, p. 258, 1849. 
Corallum composed of sclerenchyma, very irregularly reticulated. Calices shallow. 
Septa not numerous, rudimentary, and appearing to be represented by a circle of pali, the 
apex of which is papillose. 
Typ. sp., Porites conglomerata, Lamarck, loc. cit., p. 269. 
2. Genus LITHARAA. 
Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 258, 1849. 
Sclerenchyma very irregularly reticulated. Calices not very deep. Columella spongy. 
Pali rudimentary, or not existing. Septa well developed, particularly towards the wall. 
Typ. sp., Litharea Webstert, nob. ; Astrea Websteri, Bowerbank, Mag. of Nat. Hist., new series, 
vol. iv, p. 27, figs. A, B, 1840. 
3. Genus CoSCINAREA. 
Milne Edw. and J. Haime, Comptes rend. de l’Ac. des Sc., t. xxvii, p. 496, 1848. 
Corallum of a dense structure. Ca/ices rather deep ; neither pali, nor distinct walls. 
Septa crowded, very regularly fenestrate, and with crispate edges, passing without any 
interruption from one visceral chamber to the adjacent one. No epitheca. 
Typ. sp., Coscinarea Botte, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3" série, vol. ix, tab. v, fig. 2. 
