CORALS FROM THE SILURIAN FORMATION. 265 



Ch.etetes lycoperdon (pars), Hall, Paleont. of New York, vol. i, p. 64, pi. xxiii, fig. 1, 



and pi. xxiv, figs. 1 a — h, and perhaps also pi. lxxv, fig 2 

 (cset. excl.), 1847. 

 Chcetetes rugosus, Ibid., vol. i, p. 67, pi. xxiv, fig. 2. 



— petropolitanus, LYCOPERDON, and subfibrosus, D'Orbigny, Prodr. de Paleont., 



vol. i, pp. 25 and 108, 1850. 



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



(Arch, du Mus., vol. v), p. 263, 1851. 



— lycoperdon (pars), Hall, Paleont. of New York, vol. ii, p. 40, pi. xvii, fig. 1 a—f, 



1852. (Cset. excl.) 



Corallum in general free ; its basal plate flat or concave, and completely covered with 

 a concentrically wrinkled epitheca. Upper surface regularly convex, in general hemi- 

 spherical, and presenting obtuse tuberosities, about one line broad, and varying very much 

 in height. In some specimens these tubercles appear to have been worn away, and their 

 existence is indicated only by the presence of small groups of large calices, with thick 

 walls ; the calices are rather unequal in size, generally -polygonal, sometimes almost 

 circular ; the largest are about one fifth of a line in diameter ; the walls are not perforated ; 

 the tabulae are horizontal, complete, and placed at about one twelfth of a line from each 

 other. Some vestiges of septa are often visible. Young specimens are flat and discoidal. 



This species is found in the lower Silurian deposits at Caradoc and Ony River. Profr. 

 M'Coy mentions its existence at Glounmore and Ventry Harbour, in the county of Kerry ; 

 at Knockmahon, Tramore, and Ballydowan Bay, Waterford county. It is also met with 



species here mentioned, the genus Monticulipora comprehends the following fossils, which, in our work on 

 the Palseozoic Corals, were placed in the genus Chsetetes. 



C. Panderi, Milne Edwards and Jules Haime, op. cit., p. 265. 



Monticulipora filiasa, D'Orbigny, Prod, de Paleont., tab. i, p. 25. — Chcetetes filiusa, Milne 



Edwards and J. Haime, op. cit., p. 266. 

 C. Dalei, M. Edwards and J. Haime, op. cit., p. 266, pi. xix, fig. 6. 



Monticulipora ramosa, D'Orbigny, op. cit., p. 25. — Chcetetes ramosus, M. Edwards and J. 

 Haime, op. cit., p. 266 pi. xix, fig. 2. 

 ; — mammulata, D'Orbigny, loc. cit. — Chcetetes mammulatus, M. Edwards and 



J. Haime, op. cit., p. 267, pi. xix, fig. 1. 

 — frondosa, D'Orbigny, loc. cit. — Chcetetes frondosus, M.Edwards and J. Haime, 



loc. cit., pi. xix, fig. 5. 

 Ptilodictya pavonia, D'Orbigny, op. cit., p. 22. — Chcetetes -pavonia, M. Edwards and 



J. Haime, loc. cit., pi. xix, fig. 4. 

 Chcetetes rvgosus, M. Edwards and J. Haime, op. cit., p. 268, pi. xx, fig. 6. 



— Torrubiai, De Verneuil and J. Haime, Bullet. Soc. Geol. de France, s. 2, v. vii, p. 162. 



— M. Edwards and J. Haime, loc. cit., pi. xx, fig. 5. 



— Trigeri, M. Edwards and J. Haime, op. cit., p. 269, pi. xvii, fig. 6. 



— heterosolen, Keyserling, Iteise in Petsch., p. 181, fig. a, b. 



