INTRODUCTION. xlvul 
4. Genus MIcRABACIA. 
Milne Edw. and J. Haime, Comptes rendus, vol. xxix, p. 71, 1849. 
Corallum simple, lenticular, plano-convex. Sepfa not extremely numerous, straight. 
Wall scarcely echinulate, and perforated in a regular manner. 
Typ. sp., Micrabacia coronula, nob. ; Fungia coronula, Goldfuss, Petref. Germ., vol. i, tab. xiv, fig. 10. 
5. Genus ANABACTIA. 
D’Orbigny MSS. ; Milne Edw. and J. Haime, loc. cit., p. 71, 1849. 
Corallum simple and lenticular. Septa extremely numerous, thin, and projecting on 
the under side of the corallam without forming a distinct basal wall or plate.  Fos- 
sula shallow. 
Typ. sp., Anabacia orbulites, nob. ; Fungia orbulites, Lamouroux, Exp. Meth., tab. Ixxxiii, figs. 1, 2, 3. 
6. Genus GENABACIA. 
Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 71, 1849. 
Corallum composite, formed by a parent corallite similar to Anabacia, bearmg young 
calicula arranged circularly. 
Typ. sp., Genabacia stellata, nob. ; Fungia stellata, D’Archiac, Mém. Soc. Géol. France. 
7. Genus HERPOLITHA. 
Eschscholtz, Isis, 1825 ; Haliglossa, Ehrenberg, Corall., p. 50, 1834 ; Herpetolithus, Leuckart ; Dana, Zooph., 
p- 306, 1846. 
Corallum composite, free. Calicula sub-radiate, and of two sorts; the central ones 
multi-lamellate, and arranged in a line ; the others pauci-lamellate, and dispersed irregularly. 
Septa strong, and alternately thick and thin. Under surface of the common basal wall 
very echinulate. 
Typ. sp., Herpolitha limacina, nob. ; Madrepora pileus, Ellis and Solander, op. cit., tab. xlv. 
8. Genus CRYPTABACIA. 
Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 71, 1849. 
Corallum composite, free and convex above. Calices distinctly radiate ; the central 
ones arranged in a line, and more distinct than the others. Septa short, and not numerous. 
Under surface of the common basal walls strongly echinulated. 
Typ. sp., Cryptabatia talpa, nob. ; Fungia talpa, Lamarck, Hist. des An. sans Vert., t. il, p. 237. 
