142 BRITISH FOSSIL CORALS. 



developed alternately ; somewhat flexuous and rather thickened externally. Great diagonal 

 of the calices, about a line. 



This fossil was found in the Inferior Oolite at Combdown, by Mr. Pratt, and given to 

 the Geological Society by that gentleman. 



Family FUNGIDtE, (p. xlv.) 

 Genus An abaci a, (p. xlvii.) 

 Anabacia hemispherica. Tab. XXIX, figs. 2, 2a. 



PoRPiTA, BUTTON STONE, J. Walcot, Descriptions and Figures of Petrifications found near 



Bath, p. 47, fig. 62, var, E, 1/79. 



Corallum simple, almost hemispherical ; its under surface slightly concave towards the 

 centre ; its upper surface very convex, and presenting in the centre a well-defined but 

 rather shallow, circular, or elliptic fossula. Septa very thin, very closely set, and appearing 

 to dichotomise at the under surface of the corallum ; their upper edge is feebly denticulated, 

 and their tissue appears to be much more complete and less trabicular than in the other 

 species belonging to the same genus ; their number amounts to about 160. Diameter, 

 four or five Hues ; height, four lines. 



This fossil is found at Dundry. Specimens are in the Collections of the Geological 

 Society, and of Mr. Pratt. 



The elevated form of A. hemispherica distinguishes this species from all others ; these 

 are all shorter and broader, thus A. Normaniana} is quite flat and discoidal ; A. orhulite^ 

 has the form of a plano-convex lens ; and A. Bouchard-v" is subconical. 



2. Anabacia orbulites. Tab. XXIX, fig. 3. 



This fossil, as we have already stated, is found in the Inferior Oolite at Dundry, as 

 well as in the more recent oolitic formations ; it has consequently been described in the 

 preceding chapter. (See page 120.) 



1 D'Orbigny, Prod, de Paleont., tab. i, p. 2\\. 



2 See tab. xxix, fig. 3. 



2 Milne Ed'wards and J. Haime, Polyp. Foss. des Terr. Palseoz., &c., p. 122; Fungia orbulites (pars), 

 Michelin, Iconogr., tab. liv, fig. 1. 



