240 BRITISH FOSSIL CORALS. 



AcBRVULABiA RoEMERi, De Verneuil and Jules Haime, Bull. Soc. Geol. de France, 2d ser., 



vol, vii, p. 162, 1850. 

 — -^ Milne Edwards and Jules Haime, Polyp. Foss. des Terr. Palaeoz., 



p. 420, 1851. 



Corallum massive with an almost flat surface. CoraUites prismatic, and intimately 

 united together. Outer walls very slender, and often difficultly recognised in certain states 

 of fossilization. Great diagonal of the CoraUites 2 or 3 lines or more ; diameter of the 

 inner walls less than 1 line. 26 or 28 septa costal laminae, very slender, and strongly curved 

 or fiexuous towards the centre of the CoraUites. 



Found at Torquay; at Grund in the Hartz; and at Puerto de las Volcas near Pola de 

 Gordon, in the province of Leon in Spain. 



In the Collection of Dr. Battersby. 



Professor M'Coy mentions this species as having been met with also at Barton and 

 Teignmouth ; but he does not distinguish it from Acervidaria inter cellulosa. 



This species differs from all the other Acervularise by it? septa being much curved, and 

 its outer walls rudimentary. A. Battershyi} has the septa aiore numerous, more slender, 

 and provided with a paliform lobe. 



10. Genus Smithia.' 

 1. Smithia Hennahii. Tab. LIV, fig. 4. 



AsTREA Hennahii (pars), Lonsdale, in Sedgwick and Murcliison, Geol. Trans., 3d ser., 



vol. V, p. 697, pi. Iviii, fig. 3, 1840. 

 — — Phillips, Palseoz. Foss., p. 12, pi. vi, fig. 16, 1841. 



Cyathophyllum Hennahii, Bronn, Index Paleont., vol. i, p. 368, 1848. 

 LiTHosTROTioN Hennahii, Actinocyathus Hennahii, and Phillipsastrea Hennahii 



(pars), jyOrhigny, Prod, de Paleont., vol. i, pp. 106, 107, 1850. 

 Smithia Hennahii, Milne Edwards axiA Jules Haime, Polyp. Foss. des Terr. Pal., p. 421, 1851. 

 Arachnopuyllum Hennahii, M'Coy, Brit. Palseoz. Foss., p. 72, 1851. 



A polished horizontal section of this compound astreiform corallum shows that the mural 

 circles, although slender, are well characterised, and placed at a distance from each other, 

 equal to 2, 3, or even 4 times their diameter, but varying sometimes very much in the same 

 specimen. Costal radii (24 or 26 in a corallite) slender, appearing to be slightly granulated 

 on their sides, and in general much more developed, more confluent and straighter 

 in one direction than in the other, where they become irregular, fiexuous, angular or 

 geniculate ; half of the radii do not extend beyond the wall ; the others become somewhat 

 thicker at that part, and pass on towards the centre of the visceral chamber, where some 

 traces of small paliform lobes are seen. Diameter of the mural circles about 1^ fine. 



' Tab. liv, fig. 2. 



2 Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palaeoz., p -121, 1851. 



