172 BRITISH FOSSIL CORALS. 
Corallum very long, almost cylindrical, more or less curved, and having large circular 
accretion swellings. Septal fossula rather small in proportion to the size of the visceral 
chamber, and varying much in its position relative to the bending of the corallum, but 
always excentrical, and placed at a small distance from the wall. 
Principal sepfa numerous (at least 60), thin, closely set, almost equal, alternating with 
an equal number of rudimentary ones, and extending in the form of striz almost to the 
centre of the calice. Zuéule very large, numerous, and closely set. Lnterseptal loculi 
filled up with vesicular dissepiments, which appear to be independent of the tabule. 
Height of the corallum, 1 foot or more; diameter from 2 inches to 33; depth of the 
calice, 1 inch. 
The specimens of this gigantic Coral that we have seen, have been found at Swansea ; 
at Easkey, Sligo, at Kulkeag, Fermanagh ; at Tournay, in Belgium; and at Sablé, in France. 
Col. Portlock mentions its existence at Carnteel, Tyrone ; and at Clonoé, Donaghmore ; and 
Professor M‘Coy has found it at Castleton Bay, Isle of Man. Specimens are in the 
Collections of the Geological Society, the Museum of Practical Geology, the Cambridge 
Museum, the Bristol Museum, Mr. Stokes’s, &c. 
Z. cylindrica belongs to the same section as the preceding species, and approximates to 
the genus Amplexus. It differs from Z. patula’ and Z. Halli* by its large size and its 
numerous septa. By its general form it much resembles 7. gigantea,’ but it differs from 
it by the structure of the interseptal loculi, which are filled with small vesicles; whereas, in 
the last-named species, they are occupied only by the exterior portion of the tabule. 
8. ZAPHRENTIS (?) SUBIBICINA. 
CaNINIA suUBIBICINA, M‘Coy, Ann. Nat. Hist., 2d ser., vol. vii, p. 167, 1851. 
— — M‘Coy, Brit. Paleeoz. Foss., p. 89, 1851. 
“ Oprallum much curved, increasing, when young, at the rate of six lines in one inch, 
to a diameter of one inch three lines; after which, it remains nearly cylindrical for two or 
three inches more; surface with a thin, nearly smooth, epitheca, marked with obsolete 
transverse undulations of growth; when the epitheca is removed, the very fine, equal, 
costal striae are brought into view, five in two lines at a diameter of one inch two lines ; 
the outer, small, vesicular area, is rather more than a line wide, within which the sixty-five 
thick primary radiating lamelle extend, about four lines towards the centre, leaving the 
broad, flat, smooth, slightly undulated central portion of the diaphragms about six lines in 
diameter in parts of the circumference ; short secondary lamellz appear one between each 
of the primary; lateral siphonal depressions strongly marked ; vertical section shows the 
1 Caninia patula, Michelin, Icon., tab. lix, fig. 4. 
2 Milne Edwards and J. Haime, Polyp. des Terr. Paleoz., p. 341. 
3 Thid., tab. iv, fig. 1. 
