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 septa numerous (at least 60), thin, closely set, almost equal, alternating with 

 an equal number of rudimentary ones, and extending in the form of striae almost to the 

 centre of the calice. Tabula very large, numerous, and closely set. Interseptal loculi 

 filled up with vesicular dissepiments, which appear to be independent of the tabulae. 



Height of the corallum, 1 foot or more ; diameter from 2 inches to 3| ; 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 Sable, in France. 

 Col. Portlock mentions its existence at Carnteel, Tyrone ; and at Clonoe, 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 1 and Z. HalW 1 by its large size and its 

 numerous septa. By its general form it much resembles Z. gigantea, 2, 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 tabulae. 



8. ZAPHRENTIS (?) SUBIBICINA. 



Caninia subibicina, M'Coy, Ann. Nat. Hist., 2d ser., vol. vii, p. 167, 1851. 

 — — M'Coy, Brit. Palseoz. Foss., p. 89, 1851. 



" Corallum 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 lamellae 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 lamellae 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. Palseoz., p. 341. 



3 Ibid., tab. iv, fig. 1. 



