80 BRITISH FOSSIL CORALS. 



any details to the brief indications given by M. D'Orbigny. That author gives the 



follov^^ing definition: — A fine species, with large cells, somewhat elevated above the 

 common surface. 



Genus MoNTLiVALxrA, (p. xxv.) 



MoNTLIVALTIA DISPAR. Tab. XIV, figs. 2, 2«. 



FuNGiTE, Knorr and Walch, Rec. des Monum. des Catastr., vol. ii, p. 23, tab. i, i, fig. 3, 1775. 

 TuRNiP-siiAPEu MADREPORA, G. Young, Geol. Surv. of York, p. 19.5, tab. iv, fig. 8, 1828. 

 TuKBiNOLiA DISPAR, Phillips, lUustr. of tbe Geol. of York, part i, p. 120, tab. iv, 1829; 



(a very incomplete figure.) 

 ANTHOPHYbLUM OBCONicuM, Go/J/uss, petref. Germ., vol. i, p. 407, tab. x.xxvii, fig. 14, 1829. 

 LiTHODENDRON DISPAR, Guldfuss, MS., name in the collection of tbe Poppelsdorf Museum 



at Bonn. 

 MoNTLiVALTiA (?) DISPAR and M. OBCONICA, Milne Edwards and J. Ilaime, Monogr. des 



Astreides, Ann. des Sc. Nat. 3™° serie, 

 vol. X, pp. 256, 259, 1848. 

 MoNTLiVALTiA DILATATA, M. MoREAUsiACA, and M. OBCONICA (?), M'Coy, Ann. and Mag. 



of Nat. Hist., s. 2, vol. ii, p. 419, 1848. 

 TiiECOPiiYLLiA ARDUENNENSis, J3'0ri/^?iy, Prod. de Paleont., vol. i, p. 384, 1850; (a young 



specimen.) 

 Lasmophyllia radisensis, ly Orhigny , op. cit., vol. ii, p. 30, 18.i0; (adult.) 

 MONTLIVALTIA DISPAR, Milne Edwurds and J. Ilaime, Polyp. Foss. des Ter. Palseoz., etc., 



p. 73, 1851. 



Corallum turbinate, straight, or slightly curved, somewhat elongated, and presenting in 

 some specimens thick circular accretion wrinkles. Ccdice circular or suboval, with the 

 fossula rather shallow, and but slightly compressed transversely. Sejjfa 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. Bissepiments 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 2^. 



We have remarked in the Poppelsdorf Museum a specimen of this species, which 

 Goldfuss had catalogued under the name of Lithodendron 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 corallum 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 crispiis for example. 



