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 MILLEPORIDtE, {Introd., p. Iviii.) 

 1. Genus Heliolites, {Tntrod., p. Iviii.) 



Heliolites Porosa. Tab. XLVII, figs. 1, la, \b, Ic, \d, \e, If. 



Heliolithe pyrieorme, a etoiles d'une demi-ligne de diametre, &c., Guettard, Mem. sur 



les Sc. et les Arts, vol. iii, p. 454, pi. xxii, figs. 13 and 14, 1770. 

 AsTREA POROSA, Goldfuss, Petrcf. Germ., vol. i, p. 64, tab. xxi, fig. 7, 1826. 

 Heliopora pyriformis, De Blainville, Diet. Sc. Nat., vol. Ix, p. 357, 1830; Manuel 



d'Actinologie, p. 392. 



— — Sieininger, Mem. Soc. Geol. France, vol. i, p. 346, 1831. 



— interstincta, Bronn, Leth. Geogn., vol. i, p. 48, tab. v, fig. 4, 1835. 

 PoRiTES PYRIFORMIS, Lohsdale, Geol. Trans., 2d series, vol. v, pi. Iviii, fig. 4, 184Q. (Not 



Lonsdale in Silur. System.) 

 — - — Phillips, Palseoz. Foss., p. 14, pi. vii, fig. 19, 1841. 



Explanaria INTERSTINCTA, Geinitz, Grundr. der Verst., p. 568, 1845-46. 

 Geoporites POROSA and Phillipsii, VOrbigny, Prodr. de Paleont., vol. i, pp. 108, 109, 



1850. 

 Heliolites porosa, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., p. 218, 



1851. 

 Pal^sigpora pyriformis, M'Coy, Brit. Palaeoz. Fossils, p. &7, 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 Canenchpna 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 Tabulce are horizontal, or slightly 



