A monograph of the British fossil corals - kreidefossilien.de

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CORALS FROM THE GAULT. 03
3. Genus Cyclocyathus (p. xiv).
Cyclocyathus Fittoni. Tab. XI, fig. 3, 3 a, 3 b.
Corallum simple, discoidal, short ; mural disc horizontal, or slightly concave, and presenting
in its centre a small, irregular cicatrix, indicative of its primitive adherence.
Epithcca very thin, presenting some shglit concentric striae, and not preventing the i-adiate
costae from being visible. These are straight, and not very prominent ; but those of the
first and second order are well marked. The edge of the mural disc is thin, and slightly
prominent. The upper or calicular surface of the corallum is rather convex externally,
and concave towards the centre. The fossula is shallow, but large, and well marked.
Columella fasciculate, well developed, and terminated by a broad, papillose surface. Septa
forming four complete cycla. The six fundamental septal systems distinct, but the septa
of the second order not differing much from those of the first order. All the septa well
developed, straight, rather thick exteriorly, arched above, and granulated laterally ; their
outer edge somewhat crenulated, granulose, slightly concave near the mural disc, and projecting
a little towards the upper part. Pali well developed, very distinct from the septa,
and corresponding to those of the third cyclum.
Height of the corallum, two or three lines
diameter, in general not more than five or six lines.
This fossil is the only known species of the genus CtjclocyatJais ; its form renders it
very remarkable. It has been found in the Gault at Cambridge, Drayton, West Mailing,
and Folkstone, but appears to be most abundant in the last-mentioned locality. The
specimens here described belong to the collections of the Geological Society, of Mr.
Bowerbank, and of INIr. D. Sharpe.
3. Germs Trochocyathus (p. xiv).
1. Trochocyathus conulus. Tab. XI, fig. 5, 5 «.
Cakyophyllia conulus, (?) PhiVips, Illiist. of tlie Geol. of Yorkshire, tab. ii, fig. 1, 1829.
(A rougli figure without any description.)
— — Michelin, Mem. de la Sec. Geol. de France, vol. iii, p. 9A, 1838.
TuRBiNOLiA coNLLUS, Michelin, Icon. Zooph., p. i, pi. i, fig. 12, 1840.
Trochocyathus conulus, Milne Edwards and J. Haime, Mouogr. des Turbin., .\nn. des
So. Nat., 3""serie, vol. ix, p. 306, 1848.
Corallum simple, turbinate, rather elongate, straight or slightly bent, and pedicellated.
JFall presenting in general some slight traces of an incomplete epitheca. Costa simple,
distinct from the basis, closely set, delicately granulated, not very prominent, and alternately