240 BRITISH FOSSIL CORALS. 
ACERVULARIA RopmeErI, De Verneuil and Jules Haime, Bull. Soc. Géol. de France, 2d ser., 
vol. vii, p. 162, 1850. 
— — Milne Edwards and Jules Haime, Polyp. Foss. des Terr. Palzoz., 
p. 420, 1851. 
Corallum massive with an almost flat surface. Corallites prismatic, and intimately 
united together. Outer walls very slender, and often difficultly recognised in certain states 
of fossilization. Great diagonal of the Corallites 2 or 3 lines or more; diameter of the 
inner walls less than 1 line. 26 or 28 septa costal laminze, very slender, and strongly curved 
or flexuous towards the centre of the Corallites. 
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 Acervularia intercellulosa. 
This species differs from all the other Acervularize by its septa being much curved, and 
its outer walls rudimentary. 4. Battersby’ has the septa more numerous, more slender, 
and provided with a paliform lobe. 
10. Genus SMITHIA.' 
1. Smira1a Hennann. Tab. LIV, fig. 4. 
AsTREA Hpnnautt (pars), Lonsdale, in Sedgwick and Murchison, Geol. Trans., 3d ser., 
vol. v, p. 697, pl. lviu, fig. 3, 1840. 
— — Phillips, Palzeoz. Foss., p. 12, pl. vi, fig. 16, 1841. 
CyaTHOPHYLLUM Hpnnautt, Bronn, Index Paléont., vol. i, p. 368, 1848. 
Lirnostrotion Hpnnanii, ActinocyatHus HenNAnU, and PHILLIpsAsTREA HENNAHII 
(pars), D’ Orbigny, Prod. de Paléont., vol. i, pp. 106, 107, 1850. 
Smiruta Hennauit, Milne Edwards and Jules Haime, Polyp. Foss. des Terr. Pal., p.421, 1851. 
ARACHNOPHYLLUM Hennautl, M‘Coy, Brit. Paleeoz. 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 ina 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, flexuous, 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 13 line. 
MTabiuliv, shies: 2. 
2 Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleoz., p 421, 1851. 
