CORALS FROM THE SILURIAN FORMATION. 249 
large specimens are about 4 or 5 lines in diameter, and somewhat more in height ; the 
young ones are almost as broad, but scarcely more than half as high. 
Found at Dudley and at Wenlock. Specimens in the Collections of Mr. Fletcher, of 
the Geological Society of London, of the Parisian Museum, &c. 
This coral is much taller than the preceding species of the same genus, and its septa 
are thinner and less strongly denticulated. By its exterior characters it resembles very 
much the young specimens of Cyathophyllum, but its internal structure renders it quite 
distinct. 
Family MILLEPORID J, (p. lvin.) 
1. Genus Huxtoxires, (p. lvii.) 
1. Hettoritres inrerstincta. Tab. LVII, figs. 9, 9a, 96, 9c, 9d. 
MILLEPora suBROTUNDA, &c., Fougt, Ameen. Acad., vol. i, p. 99, tab. iv, fig. 24, 1749. 
Maprepora INTERSTINCTA, Linné, Syst. Nat., ed. 12, p. 1276, 1767. 
PoRPITAL MADREPORITE, Parkinson, Org. Rem., vol. ii, pl. vii, fig. 2—5, 1808. 
MADREPORITES INTERSTINCTUS, Wahlenherg, Nov. Acta Soc. Scient. Upsal., vol. vii, p.98, 1821. 
SaRcrnuta Punotata, Fleming, Brit. Anim., p. 508, 1828. 
= — S. Woodward, Syn. Table of Brit. Org. Rem., p. 5, 1850. 
ASTR@A CORONA, Ch. Morren, Descr. Cor. Belg., p. 64, tab. xxi, figs. 1, 2, 1832. 
Astrea Porosa, Hisinger, Leth. Suec., p. 98, tab. xxvii, fig. 2, 1837. (Not Goldfuss.) 
PoRITES PYRIFORMIS, Lonsdale, Silur. Syst., p. 686, pl. xvi, figs. 2, 2a, 26, 2c (cet. excl.), 
1839. 
HELIOPORA INTERSTINCTA, Hichwald, Sil. Schist. Syst. in Esthland, p. 199, 1840. 
Porites pyrtroRMIS, Lonsdale, Russ. and Ural, vol. i, p. 625, 1845. 
Porites INTERSTINCTA, Keyserling, Wiss. Beob. auf ein Reise in das Petschora Land, p. 175, 
1846. 
Grororites LONSDALEI, PYRIFORMIS, and tntERSTINCTA, D’Orbigny, Prodr. de Paleont., 
vol. i, pp. 49, 50, 1850. 
PALHoPoRA INTERSTINCTA, M‘Coy, Brit. Paleeoz. Foss., p. 15, 1851. 
HELIOLITES INTERSTINCTA, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz. 
(Arch. du Mus., vol. v), p. 214, 1851. 
HELIOLITES pyrirorMIs, Hall, Paleont. of New York, vol. ii, p. 133, pl. xxxvi a, fig. 1, 1852. 
Corallum composite, massive, in general more or less round or gibbose, sometimes 
subdendroid. -Calices closely set (at a distance equal only to their diameter or to 
two thirds of it), and of the same size in the different parts of the same compound 
specimen ; their edge circular, and slightly prominent ; in well preserved specimens a small 
columellary elevation is visible on the surface of the uppermost tabula; 12 septa, 
somewhat unequal in size alternately. Polygonal divisions of the coenenchyma regular 
