60 BRITISH FOSSIL CORALS. 



Family FUNGIDtE (p. xlv). 

 Genus Micrabacia (p. xlvii). 

 Micrabacia coronula. Tab. X, fig. 4, 4 a, 4 b, 4 c. 



Cyclolites, W. Smith, Strata identified by Organic Fossils, p. 12; Greensand, p. 15, 1816. 

 Fungta coronula, Gold/uss, Petref. Germ., vol. i, p. 50, tab. xiv, fig. 10, 1826. 



— — F.A.Rceme?;J)ie Yerstein. des Norddeutschen Kreidegebirges, p. 25, 1840. 



— — Atoms, Cat. of Brit. Fossils, p. 38, 1843. 



Fungia clathrata (?) Geinitz, Grundriss der Versteinerungskunde, tab. xxiii, fig. 2, 1849. 



Corallum simple, lenticular, short ; its under surface horizontal or slightly concave ; its 

 upper surface somewhat convex. Mural disc completely naked and regularly perforated 

 by small intercostal pores. Costa closely set, almost straight, equally narrow, not pro- 

 minent, and but slightly echinulated ; only twelve of them arise in the centre of the disc, 

 but these soon bifurcate, and the twenty-four costse so formed soon divide again ; at about 

 half the distance from the centre to the circumference of the disc each costa bifurcates once 

 more, and the two terminal costse so formed are grouped two by two towards the periphery 

 of the disc. The granulations which form all these costa3 are not very distinct, and are 

 arranged in single lines. Calicular fossula small and not very deep, but well marked and 

 rather elongated laterally. Columella very small, oblong, and subpapillose. Septa forming 

 five complete cycla, and corresponding to the intercostal spaces ; those of the last cyclum 

 quite rudimentary ; the others tall, thin, straight, and united by sub-spiniform trabiculae. 

 Those of the first cyclum larger than the others, and augmenting slightly in thickness 

 towards the middle ; the secondary ones almost as large ; all delicately denticulated along 

 their upper edge, and much thinner towards their outer and inferior angle than in any 

 other part. Diameter, three or sometimes four lines ; height, one line and a half. 



The above-described fossils were found in the Greensand at Warminster, in Wiltshire, 

 and according to William Smith, who was the first author that mentions this fossil, 

 are also met with at Chute Farm and Puddle Hill, near Dunstable. 



By an attentive comparison with the specimens described by Goldfuss, and belonging 

 to the PoppelsdorfT Museum at Bonn, we have ascertained the specific identity of this 

 British Coral with the Fungia coronula found in the chalk of Essen. Specimens exist in 

 Mr. Bowerbank's cabinet, and in the collections belonging to the Geological Society, 

 the Museum of Paris, the Museum of Bonn, and M. Defrance at Sceaux, who has 

 designated it by the unpublished name of Fungia clubia. 



