CORALS FROM THE SILURIAN FORMATION. 265 
CHETETES LYCOPERDON (pars), Hall, Paleont. of New York, vol. i, p. 64, pl. xxin, fig. 1, 
and pl. xxiv, figs. 1 a—h, and perhaps also pl. Ixxv, fig. 2 
(ceet. excl.), 1847. 
Cu#£TETEs RUGOsUS, Ibid., vol. i, p. 67, pl. 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. Palzeoz. 
(Arch. du Mus., vol. v), p. 263, 1851. 
— _LYCOPERDON (pars), Hall, Paleont. of New York, vol. ii, p. 40, pl. xvii, fig. 1 a—f, 
1852. (Cet. 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 tabulz 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. Prof. 
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 Palzeozoic Corals, were placed in the genus Chetetes. 
C. Panderi, Milne Edwards and Jules Haime, op. cit., p. 265. 
Monticulipora filiasa, D’Orbigny, Prod. de Paléont., tab. i, p. 25.—Chetetes filiusa, Milne 
Edwards and J. Haime, op. cit., p. 266. 
C. Dalei, M. Edwards and J. Haime, op. cit., p. 266, pl. xix, fig. 6. 
Monticulipora ramosa, D’Orbigny, op. cit., p. 25.—Chetetes ramosus, M. Edwards and J. 
Haime, op. cit., p. 266 pl. xix, fig. 2. 
— mammulata, D’Orbigny, loc. cit.—Chetetes mammulatus, M. Edwards and 
J. Haime, op. cit., p. 267, pl. xix, fig. 1. 
— JSrondosa, D’ Orbigny, loc. cit.—Chetetes frondosus, M. Edwards and J. Haime, 
loc. cit., pl. xix, fig. 5. 
Ptilodictya pavonia, D’Orbigny, op. cit., p. 22.—Chetetes pavonia, M. Edwards and 
J. Haime, loc. cit., pl. xix, fig. 4. 
Chetetes rugosus, M. Edwards and J. Haime, op. cit., p. 268, pl. xx, fig. 6. 
—  Torrubiai, De Verneuil and J. Haime, Bullet. Soc. Géol. de France, s. 2, y. vii, p. 162. 
—M. Edwards and J. Haime, loc. cit., pl. xx, fig. 5. 
—  Trigeri, M. Edwards and J. Haime, op. cit., p. 269, pl. xvii, fig. 6. 
— _ heterosolen, Keyserling, Reise in Petsch., p. 181, fig. a, 6. 
