CORALS FROM THE MOUNTAIN LIMESTONE. 185 
that the central area is distinct from the preceding one; and that, in the central area, the 
oblique lines, resembling a small tent, indicate the position of the small tabula which are 
crossed by the principal septa. 
Height of the corallum (in the large specimens) 24 inches; diameter of the calice very 
variable. 
Found at Oswestry; Nunney, near Frome; Castleton, Derbyshire; Wellington, in 
Shropshire ; and, according to Professor M‘Coy, at Beith, Ayrshire. 
Specimens are in the Collections of the Museum of Practical Geology, of Bristol, of 
Mr. Bowerbank, &c. 
This species is characterised by its well-developed columella, and the very regular 
arrangement of its septa. 
The Fossil mentioned by Col. Portlock under the name of Zurbinolia mitrata,’ and 
found by that Geologist in the carboniferous formation at Benburb, appears to belong to 
this species. 
2. CLISIOPHYLLUM conIsEPtUM. Tab. XXXVII, figs. 5, 5a. 
CYATHOPHYLLUM CONISEPTUM, Keyserling, Reise in Petschora, p. 164, pl. ui, fig. 2, 1846. 
CyarHaxonta contsEpta, D’ Orbigny, Prodr. de Pal., t. i, p. 158, 1850. 
CLISIOPHYLLUM CONIsEPTUM, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzoz., 
p. 411, 1851. 
Corallum cylindro-conical, very tali, curved, and presenting well-marked, but small 
accretion ridges. Ca/lice circular. Columellarian protuberance conical, prominent, and 
bearing at its summit a small columellarian lamella. Sep¢a not very numerous (60 or 70), 
thin, unequally developed alternately, some of the largest advancing quite to the centre of 
the calice, and ascending the columellarian protuberance, under the form of flexuous 
ridges. 
Height of the corallum, in general, 3 or 4 inches, and diameter of the calice about 
13 inch; sometimes much larger. 
Found at Ticknell, Mold, and Corwen, in England; and, according to Count 
Keyserling, at Ylytsch in Russia. The large specimen figured in this Monograph belongs 
to the Collection of the Bristol Museum. 
This species is remarkable for its elongate, cylindro-conical form, the smallness of the 
central lamina placed at the top of the columellarian protuberance, and the great develop- 
ment of this conical protuberance itself. C. coniseptum differs also from C. Hisingeri” by 
1 Report on the Geology of Londonderry, p. 331. 
* Milne Edwards and Jules Haime, Monogr. des Polyp. des Terr. Paleeoz., tab. vii, fig. 5. 
e 
