264. BRITISH FOSSIL CORALS. 
This small ramose coral appears to be intermediate between true Alveolites and Ccenites ; 
it resembles the latter by the great development of its coenenchyma, and Alveolites by the 
almost circular form of the calices, but differs from both by the direction and the mode of 
arrangement of the corallites, which, instead of being oblique, are almost perpendicular to 
the axis of the branches, and form vertical series somewhat as in the genus Seriatopora. 
When this fossil becomes more completely known in its structural characters, it will 
probably form the type of a new generical division. Mr. Hall places it in his genus 
Cladopora, which is partly composed of Bryozoa. 
Diameter of the branches about one and a quarter line; diameter of the calices about 
one fifth of a line. 
Dudley. Mr. Hall mentions its existence in the lower part of the Niagara limestone 
at Lockport. 
Collections of Mr. Fletcher and of the Parisian Museum. 
3. Genus Monvicuipora.! 
1. MonvIcuULIPORA PETROPOLITANA. 
FavosITES PETROPOLITANUS, Pander, Russ. Reiche, p. 105, tab. i, figs. 6, 7, 10, 11 (exel., 
fig. 8), 1830. 
CALAMOPORA FIBROSA (pars), Goldfuss, Petvef. Germ., vol. i, p. 215, tab. Ixiv, fig. 9, 1833. 
FavosITES HEMISPHERICUS, St. Kutorga, Zweit. Beitr. zur Geogn. und Paleont. Dorp., 
p- 40, tab. viii, fig. 5, and tab. ix, fig. 3, 1837. 
CaLaMopora FIBROSA, Eichwald, Sil. Syst. in Esthl., p. 197, 1840. 
FavositEs Lycopopitrss, Lardner Vanuxem, Geol. of New York, 3d part, p. 46, fig. 3, 1842. 
— — Will. Mather, Geol. of New York, Ist part, p. 397, fig. 3, 1843. 
CHEZTETES PETROPOLITANUS, Lonsdale, in Murch., Vern. and Keys., Russ. and Ural, vol. i, 
p. 596, tab. a, fig. 10, 1845. 
— — Keyserling, Reise in Petsch., p. 180, 1846. 
FavosITES PETROPOLITANA, M‘Coy, Syn. of the Silur. Foss. of Irel., p. 64, pl. iv, fig. 21, 
1846. 
1 D’Orbigny, Prodr. de Paléont., vol. i, p. 25, 1850; Nebulipora, M‘Coy, Ann. and Mag. of Nat. 
Hist., 2d series, vol. vi, p. 283, 1850; and Brit. Paleeoz. Fossils, p. 22, 1851. 
This generical division was proposed by M. D’Orbigny, since the publication of the Classification of 
Polypi, given in the introduction to this work, and the great resemblance which exists between the corals 
included in this new group and the common Chetetes induced us to reject it; in our Monographie des 
Polypiers Fossiles des Terrains Paleozoiques, we therefore included all these fossils in the old genus 
Cheetetes of Fischer. But since that we have observed some specimens in which the fissiparous mode of 
reproduction, attributed by Fischer to his original Cheetetes, is quite distinct ; whereas, in the species to 
which M. D’Orbigny gives the name of Monticulipora, the gemmiparous reproduction is evident. We there- 
fore now think it advisable to admit the generical distinction established by that paleontologist. Besides the 
