80 BRITISH FOSSIL CORALS. 
any details to the brief indications given by M. D’Orbigny. That author gives the 
following definition:—A fine species, with large cells, somewhat elevated above the 
common surface. 
Genus MONTLIVALTIA, (p. XXV.) 
MonTiivaLiia DISPAR. ‘l'ab. XIV, figs. 2, 2a. 
> to) 
Funaire, Knorr and Walch, Rec. des Monum. des Catastr., vol. u, p. 23, tab. i, 7, fig. 3, 1775. 
TURNIP-SHAPED MADREPORA, G. Young, Geol. Surv. of York, p. 195, tab. iv, fig. 8, 1828. 
TURBINOLIA DIsPpaR, Phillips, Illustr. of the Geol. of York, part i, p. 126, tab. iv, 1829; 
(a very incomplete figure.) 
ANTHOPHYLLUM oBcONICUM, Goldfuss, Petref. Germ., vol. i, p. 407, tab. xxxvil, fig. 14, 1829. 
LITHODENDRON DIspar, Goldfuss, MS., name in the collection of the Poppelsdorf Museum 
at Bonn. 
MontTrivattia (?) pispar and M. opcontca, Milne Edwards and J. Haime, Monogr. des 
Astreides, Ann. des Sc. Nat. 3™* série, 
vol. x, pp. 256, 259, 1848. 
Montiivautra pizatata, M. Morzavusiaca, and M. opconica (?), M‘Coy, Ann. and Mag. 
of Nat. Hist., s. 2, vol. u, p. 419, 1848. 
THECOPHYLLIA ARDUENNENSIS, D’Orbigny, Prod. de Paléont., vol. i, p. 384, 1850; (a young 
specimen.) 
LASMOPHYLLIA RADISENSIS, D’ Orbigny, op. cit., vol. ii, p. 30, 1850; (adult.) 
Monvtuivautra DIspaR, Milne Ldwards and J. Haime, Polyp. Foss. des Ter. Palzeoz., etc., 
p. 73, 1851. 
Corallum turbinate, straight, or slightly curved, somewhat elongated, and presenting in 
some specimens thick circular accretion wrinkles. Ca/ice circular or suboval, with the 
fossula rather shallow, and but slightly compressed transversely. Sep¢a thin, quite straight, 
not presenting many granulations, very closely set, and forming six complete cycla. Those 
of the first four cycla almost equal, and reaching nearly to the centre of the visceral 
chamber, where they meet along their inner edge. Those of the fifth cyclum almost as 
thick as the principal ones, but not extending as far inwards, and quite free along their 
inner edge. ‘Those of the sixth cyclum extremely thin, and not joined to the neighbouring 
septa of the superior orders. Dissepiments well developed, and appearing to be very 
oblique, for, in a horizontal section of the corallum, a considerable number of them are 
shown, especially near the wall, and are situated at about one line apart. 
Height 3 or 4 inches; breadth of the calice 2 or 23. 
We have remarked in the Poppelsdorf Museum a specimen of this species, which 
Goldfuss had catalogued under the name of Zithodendron dispar, and which presents a 
fissiparous calice ; but we must consider this anomaly as being quite accidental, for we 
know of no specimen of a compound coral/um which can be referred to the same species, 
and we have sometimes met with similar cases of monstrosity in corals which are evidently 
simple, and incapable of fissiparous generation : Sphenotrochus crispus for example. 
