INTRODUCTION. xlv 
79. Genus OULANGIA. 
Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 497, 1848. 
Corallum composed of very low, cylindrical corallites, which appear to arise by gem- 
mation on a basal incrusting expansion, and having their walls naked and costate, as 
in the preceding genus, but with a highly-developed, papillose columella. Septa very 
exsert, closely set ; those of the principal cycla having their upper edge almost entire. 
Typ. sp., Oulangia Stokesiana, Milne Edw. and J. Hie, Ann. des Sc. Nat., 3™° série, vol. x, 
tab. vii, fig. 4. 
Aberrant Group. 
PSEUDASTREID &. 
Corallum composite, thin, and foliaceous, and increasing by extra-calicular gemmation. 
Corallites short, well circumscribed, and dispersed on the surface of a common lamellar 
plate. Coenenchyma echinulate. Septa well developed, very echinulate. Déssepiments not 
numerous. No synapticule. Common basal wall imperforate, sub-costulate, and naked. 
Genus ECHINOPORA. 
Lamarck, Hist. des An. sans Vert., vol. u, p. 252, 1816; EHchinastrea, Blainville, Dict. des Sc. Nat., 
vol. lx, p. 343, 1830. 
Corallum adherent, near the centre, and expanding into large foliaceous, lobated 
lamme. Calices circular, with an exsert margin. 
Typ. sp., Echinopora rosularia, Lamarck, loc. cit., p. 253; Milne Edw., Atlas du Regne Anim. de 
Cuvier, Zooph., tab. Ixxxiii ter, fig. 1. 
Transitional Group. 
PSEUDOFUNGID:. 
Corallum composite and foliaceous, having a perforated plate or basal wall (as in 
Fungidz) and interseptal dissepiments (as in Astreidae). Ca/ices forming radiating series, 
separated by lobes or ridges. No synapticule. 
Genus MERULINA. 
Ehrenberg, Corall. des Roth. Meeres, p. 104, 1834. Typ. sp., Merulina ampliata, Ehrenberg, loc. cit. 
Family IV. 
FUNGID. 
Dana, Expl. Exped., Zooph., p. 283, 1846. 
Corallum simple or composite, very short and expanding, so as to constitute a disc 
or foliaceous lamina.  Calice very shallow, and open laterally in simple species ; 
