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 Cyatlioplujllum, but its internal structure renders it quite 

 distinct. 



Family MILLEPORID.^, (p. lviii.) 

 1. Genus Heliolites, (p. lviii.) 

 1. Heliolites interstincta. Tab. LVII, figs. 9, 9a, 9b, 9c, 9d. 



Millepora subrotenda, &c, Foiifft, Amsen. Acad., vol. i, p. 99, tab. iv, fig. 24, 1749. 

 Madrepora interstincta, Linne, Syst. Nat., ed. 12, p. 1276, 1767. 

 Porpital madreporite, Parkinson, Org. Rem., vol. ii, pi. vii, fig. 2 — 5, 1808. 

 Madreporites ixteusti'sctvs, JFahlenberff, Nov. Acta Soc.Scient. Upsal., vol. viii,p.98, 1821 . 

 Sarcinula punctata, Fleming/, Brit. Anim., p. 508, 1828. 



— — S. Woodward, Syn. Table of Brit. Org. Rem., p. 5, 1850. 



AsTRiEA corona, Ch. Morren, Descr. Cor. Belg., p. 64, tab. xxi, figs. 1, 2, 1832. 

 Astrea porosa, Hisinger, Leth. Suec, p. 98, tab. xxviii, fig. 2, 1837. (Not Goldfuss.) 

 Porites pyriforjiis, Lonsdale, Silur. Syst., p. 686, pi. xvi, figs. 2, la, 2b, 2e (cset. excl.), 



1839. 

 Heliopora interstincta, Eichivald, Sil. Schist. Syst. in Esthland, p. 199, 1840. 

 Porites pyriforjiis, Lonsdale, Russ. and Ural, vol. i, p. 625, 1845. 

 Porites interstincta, Kei/serli)ig,\\ T iss. Beob. auf ein Reise in das Petschora Land, p. 175, 



1846. 

 Geoporites Lonsdalei, pyriforjiis, and interstincta, IfOrbigny, Prodr. de Palcont., 



vol. i, pp. 49, 50, 1850. 

 Pal/eopora interstincta, M'Coy, Brit. Palseoz. Foss., p. 15, 1851. 

 Heliolites interstincta, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz. 



(Arch, du Mus., vol. v), p. 214, 1851. 

 Heliolites pyrieormis, Hall, Paleont. of New York, vol. ii, p. 133, pi. xxxvi a, fig. 1, 1852. 



Gorallum 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 ccenenchyma regular 



