INTRODUCTION. xlvii 



4. Genus Micrabacia. 



Milne Edw. and J. Haime, Comptes rendus, vol. xxix, p. 71, 1849. 



Corallum simple, lenticular, plano-convex. Septa 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 An abaci a. 



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 corallum without forming a distinct basal wall or plate. Fos- 

 sula shallow. 



Typ. sp., Anabacia orbulites, nob. ; Fungia orbulites, Lamouroux, Exp. Meth., tab. lxxxiii, 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, bearing young 

 calicula arranged circularly. 



Typ. sp., Genabacia stellata, nob. ; Fungia stellata, D'Arcbiac, Mem. Soc. Geol. France. 



7. Genus Herpolitha. 



Escbscboltz, 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 Crtptabacia. 



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. ii, p. 237. 



