212 BRITISH FOSSIL CORALS. 
representative in the actual Fauna, nor in the Tertiary and Secondary Formations. Three 
of these Devonian fossils exist also in the Silurian rocks, but all the others appear to be 
peculiar to the Devonian period. 
The principal localities from which these corals have been obtained are Torquay, 
Plymouth, and Newton Bushel. The specimens described in this Monograph belong 
mostly to the collections of Dr. Battersby, Mr. Pengelly, Mr. Bowerbank, Mr. Phillips, 
and the Geological Society; some of the latter were more particularly valuable to us, 
being the type specimens of the species described in 1840 by Mr. Lonsdale in the memoir 
of Messrs. Sedgwick and Murchison, on the Devonian Formation of England. 
Family MILLEPORID A, (Zntrod., p. lvui.) 
1. Genus Hewt0xites, (Lntrod., p. li.) 
Heuiouites Porosa. Tab. XLVII, figs. 1, la, 14, le, 1d, le, If 
HELIOLITHE PYRIFORME, a étoiles d’une demi-ligne de diametre, &c., Guettard, Mém. sur 
les Se. et les Arts, vol. iii, p. 454, pl. xxii, figs. 13 and 14, 1770. 
ASTREA PoROSA, Goldfuss, Petref. Germ., vol. i, p. 64, tab. xxi, fig. 7, 1826. 
HELIOPpoRA PyRIFORMIS, De Blainville, Dict. Se. Nat., vol. lx, p. 357, 1830; Manuel 
d’Actinologie, p. 392. 
— — Steininger, Mém. Soc. Geol. France, vol. i, p. 346, 1831. 
— INTERSTINCTA, Bronn, Leth. Geogn., vol. i, p. 48, tab. v, fig. 4, 1835. 
Porites pyrirorMis, Lonsdale, Geol. Trans., 2d series, vol. v, pl. lviii, fig. 4, 1840. (Not 
Lonsdale in Silur. System.) 
— — Phillips, Paleoz. Foss., p. 14, pl. vii, fig. 19, 1841. 
EXPLANARIA INTERSTINCTA, Geinitz, Grundr. der Verst., p. 568, 1845-46. 
Gnoporttes porosa and Puinurpsit, D’Orbigny, Prodr. de Paléont., vol. i, pp. 108, 109, 
1850. 
Hettorires porosa, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz., p. 218, 
1851. 
PaLmopora PYRIFORMIS, M‘Coy, Brit. Palzeoz. Fossils, p. 67, 1851. 
Corallum compound, forming generally a globular mass, which in some specimens is 
subgibbose, in others cylindrical; sometimes composed of very distinct superposed 
layers. Calices somewhat unequal in size, placed rather irregularly at distances equal to 
about two or three times their diameter, surrounded by a very thin rim, and slightly 
elevated above the general surface of the corallum. ‘The calicular fossula large and rather 
deep. Septa, twelve in number, somewhat unequal in size alternately, almost straight, 
thick exteriorly, and extending almost to the centre of the visceral cavity. The pores of 
the Canenchyma small, almost equal in size and nearly regularly hexagonal ; one eighth 
of a line in diameter. Calices almost half a line in diameter. 
A vertical section of this corallum shows that the 7uéule are horizontal, or slightly 
