CORALS FROM THE MOUNTAIN LIMESTONE. 157 
Corallum forming a thin incrustating expansion, its upper surface almost horizontal. 
Calices polygonal, very deep, rather unequal in size, and separated by slightly exsert 
ridges. Septal strie 40 or 50 in number, almost equally developed, subvermiculate, and 
extending on the tabul to a small distance from the walls. Zable closely set, almost 
horizontal towards the centre of the corallites, but very irregular towards their circum- 
ference. Diagonal of the calices from 5 to 8 lines. 
Found at Hook-point, in Ireland, by Professor M‘Coy ; and at Tournay, in Belgium. 
We have not been enabled to study any British specimens of this species; those that 
we have examined belonged to the carboniferous formation of Belgium; but the figure 
published by Professor M‘Coy is sufficient to establish the specific identity between the 
Continental and the Irish fossil here alluded to; and we feel, consequently, no hesitation 
in inscribing JZ. antiqua in the list of British Corals. 
In this species, as well as in JZ. geometricu' and in M. concinna’, there are very 
numerous, almost horizontal, tabule; a structural peculiarity, which sufficiently dis- 
tinguishes them from JZ. favosa,’ M. tenuisepta,’ M. megastoma, and M. convera,’ Mm 
which the endotheca is entirely vesicular. JZ. antiqua differs from J. geometrica by the 
regularity of its calices, the prolongation of the septal striae on the upper surface of the 
tabulz ; the latter character, and its large size, also distinguishes it from JZ. concenna. 
3. Genus ALVEOLITES, (p. Ix.) 
1. Atveonitzs sEptosa. Tab. XLV, figs. 5, 5a, 5d. 
FavosivEs seprosvus, Fleming, Brit. Anim., p. 529, 1828. 
— —_ S. Woodward, Syn. Table of Brit. Org. Rem., p. 5, 1830. 
— — Phillips, Geol. of Yorkshire, 2d part, p. 200, pl. ii, figs. 6, 7, 8, 1836. 
— — M‘Coy, Syn. Carb, Foss. of Ireland, p. 192, 1844. 
CHEHTETES SEPTOSUS, Keyserling, Reise in Petschora, p. 183, 1846. 
Atynouites septosa, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz., p. 259, 
1851. 
Cuxteres spptosus, M‘Coy, Brit. Palzoz. Foss., p. 82, 1851. 
Corallum forming an incrustating, slightly convex, or subgibbose mass, which is in 
general composed of superposed strata. Cadices unequally developed, somewhat irregular 
in form, but in general polygonal and not having a prominent edge. Walls rather thin. 
The solitary septal process well characterised, and sometimes facing two small denticula. 
Breadth of the calices half a line or a little more. 
Milne Edwards and Jules Haime, Polyp. Paleoz., tab. xvii, fig. 3. 
? Lonsdale, in Murch., Vern., and Keyser., Geology of Russia, vol. i, p. 611, pl. a, fig. 3. 
3 See tab. xliv, fig. 2. * See tab. xliv, fig. 1. 5 See tab. xliv, fig. 3. 
5 D’Orbigny, Prod., vol. i, p. 107; Milne Edwards and J. Haime, op. cit., p. 251, tab. xvi, fig. 1. 
