180 BRITISH FOSSIL CORALS. 



Corallum straight, or but very slightly curved ; sometimes as broad as high, in other 

 specimens very elongate, and having well characterised circular accretion swellings at 

 unequal distances. Calice almost circular, with a small, shallow, central cavity, near 

 which some appearance of a small septal fossula is sometimes visible ; a broad convex 

 elevation surrounding this central depression, and the exterior portion of the calice forming 

 a flat or somewhat concave zone. Septa numerous, (120 to 140), well developed, some- 

 what unequal alternately, thin, closely set, and for the most part quite straight ; the 

 principal ones reach to the centre of the calice, the others almost as far. Specimens 8 or 

 10 inches long are not uncommon; but others, in which the calice is equally broad, are 

 not more than two inches high. 



Found at Bristol, Lilleshall, Clifton, and, according to Professor Phillips, also at Bolland, 

 Ribblehead, Penyghent, Bowes, Hawes, Coverdale, Brough, Ashfell, Orton, in Northumber- 

 land, Durham, Derbyshire, Florence Court, Stradone, and Ireland. Specimens are in the 

 collections of the Geological Society, of the British Museum, of Professor Phillips, at York, 

 of the Paris Museum, and of M. de Verneuil. 



This coral remains always simple, but bears great affinity to C. helianthoides 1 and 

 C. regium ; 2 but its tabulae are larger than in either of these species, and its septa are also 

 more numerous than in the first. It differs also from C. Murchisoni 2, by the great 

 development of the tabulae and the thickness of its septa. 



4. Cyathophyllum regium. Tab. XXXII, figs. 1, la, 2, 3, 4, 4a. 



Cyathophyllum regium, Philips, Geol. of Yorkshire, 2d part, p. 201, pi. ii, figs. 25, 26, 1836. 

 Astrea carbonaria, M'Coy, Ann. and Mag. of Nat. Hist., 2d Ser., vol. hi, p. 125, 1849. 

 Favastrea regia, IfOrbigny, Prodr. de Palseont., vol. i, p. 160, 1850. 

 Cyathophyllum regium, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Pal., 



p. 376, 1851. 

 Astrea (palastr^a) carbonaria, M'Coy, Brit. Pal. Foss., p. Ill, pi. 3a, figs. 7 and 



3 b, fig. 1, 1851. 



Corallum compound, massive and astreiform. Calices polygonal, very unequal in size, 

 and separated by simple linear ridges ; their central depression large but not deep, and 

 surrounded by a circular tumefaction ; their exterior portion flat or somewhat concave. 

 Septa numerous (120 to 130), very thin, closely set, sub-geminate, almost equal exteriorly, 

 but alternatively extending more or less internally ; some not reaching quite to the centre 

 of the calice, the others uniting and becoming slightly flexuous, and exsert there, so as to 

 constitute a kind of false columella of an oblong form, that bears a small longitudinal 

 sulcus resembling a rudimentary septal fossula. Diagonal of the calices varying from 1 

 to 3 inches. 



1 Goldfuss, Pctref. Germ., vol. i, tab. xx, fig. 2; tab. xxi, fig. 1. 



2 See tab. xxxii, figs. 1, 2, 3, 4. 3 See tab. xxxiii, fig. 3. 



