176 BRITISH FOSSIL CORALS. 
4. AMPLEXUS SPINOSUS. 
AmpLexus sprnosus, De Koninck, Ann. Foss. des Terr. Carb. de Belg., p. 28, pl. oc, 
fig. 1, 1842. 
CyaTHAXoNnrIA SPINOSA, Michelin, Icon., p. 257, pl. lix, fig. 10, 1846. 
= — D’ Orbigny, Prod. de Pal., vol. i, p. 158, 1850. 
CaLOPHYLLUM sPINOsUM, M‘Coy, Brit. Paleeoz. Foss., p. 91, 1851. 
AmpLexus spinosus, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz., p. 346, 
1851. 
Corallum elongate, cylindro-turbinate, somewhat twisted, acute at its basis, with a 
rudimentary epitheca and but slightly developed circular accretion swellmgs. Costal ridges 
flat, sub-equal, closely set, smooth towards the upper part of the corallum, but in the basal 
half of this armed with a series of small ascendant spines. Cadice rather deep. Septal 
fossula small. Upper tabula not very broad, especially in young specimens, and some- 
times protruding a little in the cavity of the calice. Principal sepéa not numerous, (sixteen,) 
very thin, very narrow upwards, presenting a concave denticulated edge mwards, slightly 
bent towards the centre of the corallum, and alternating with an equal number of very 
small ones. Height of the corallum about 2 inches ; diameter of the calice about 5 lines. 
Found in the black carboniferous shale at Poolwart, Isle of Man, and at Tournay, in 
Belgium. Specimens are in the collections of the Cambridge Museum, the Paris Museum, 
the Ecole des Mines, M. de Verneuil, &c. 
This Coral is distinguished from all the other species of Amplexus by the spines which 
are developed on the surface of the lower part of its wall. 
5. Amptexus Henstowr. Tab. XXXIV, figs. 5, 5a. 
CYATHOPHYLLUM cCERATITES, Michelin, Icon. Zooph., p. 181, pl. xlvii, fig. 3, 1845. (Not 
Goldfuss.) 
AmpLexus Henstow1, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz., p. 346, 
pl. x, fig. 3, 1851. 
Corallum turbinate, not very elongate, not strongly curved, and having but slight 
circular accretion swellings. Zpitheca probably delicate, and when worn off leaving 
uncovered numerous flat equally developed costa. Ca/ice filled up with extraneous matter 
in all the specimens examined, but appearing to be deep. Zadule irregularly developed, 
large, sloping downwards towards the ventral or concave side of the corallum, and reaching 
almost from wall to wall. Sepéa appearing to be numerous, narrow, and unequal alter- 
nately. Septal fossula not observable, on account of the filling up of the calice. Height 
of the corallum in the large specimens 3 inches; diameter of the calice 2 inches or more. 
