A monograph of the British fossil corals - kreidefossilien.de
A monograph of the British fossil corals - kreidefossilien.de
A monograph of the British fossil corals - kreidefossilien.de
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Petref.<br />
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CORALS FROM THE GAULT. 69<br />
beut in two ; from T. Boissyana, T. Patula} T. cernua, and T. crassa,' by being subpedicellated,<br />
and not adherent in <strong>the</strong> adult state ; from T. irregularis, T. corniculum,<br />
T. Faujasii, T. GervuUii, and T. uricornis? by being strongly compressed quite down to<br />
<strong>the</strong> basis and from T. Saltzhuryiensis, T. cuneolus, T. compressa, T. complanata,<br />
T. Basochesii, and T. fuherosu, by <strong>the</strong> existence <strong>of</strong> <strong>the</strong> above-mentioned four <strong>de</strong>ep mural<br />
fm'rows. By <strong>the</strong>ii- general form, all <strong>the</strong>se <strong>corals</strong> much resemble many species belonging<br />
to <strong>the</strong> division <strong>of</strong> Cyathininae, but diflFer from <strong>the</strong>m, and from all o<strong>the</strong>r Turbinolidse, by<br />
having interseptal dissepiments.<br />
This <strong>fossil</strong> was found in <strong>the</strong> Gault at Folkstone, Ijy<br />
Mr. Bowerbank.<br />
The LiTHODENDRON GBACiLE, Goldfuss/ is mentioned by Mr. Morris^ as having been<br />
found in <strong>the</strong> Gault <strong>of</strong> Kent, but as yet we have not met with any specimens <strong>of</strong> that species<br />
in any <strong>of</strong> <strong>the</strong> <strong>British</strong> palaeontological collections.<br />
1<br />
See our Monogr. <strong>de</strong>s Astrei<strong>de</strong>s, Aun. <strong>de</strong>s Sc. Nat., 3"''serie, vol. x, p. 236.<br />
- We here <strong>de</strong>signate, un<strong>de</strong>r <strong>the</strong> name <strong>of</strong> Trochosmilia ci-assa, <strong>the</strong> <strong>fossil</strong> <strong>de</strong>scribed by M. Michelin un<strong>de</strong>r<br />
<strong>the</strong> name <strong>of</strong> Turbinolia cernua, Goldfuss, and by ourselves as TrochosmiHa cernua ; for, on comparing it with<br />
<strong>the</strong> specimens previously <strong>de</strong>scribed by Goldfuss un<strong>de</strong>r <strong>the</strong> name <strong>of</strong> Turbinolia cernua, we have ascertained<br />
that <strong>the</strong>y are not specifically i<strong>de</strong>ntical.<br />
The species which must retain <strong>the</strong> name first applied by Goldfuss presents <strong>the</strong> following characters<br />
Corallum pedicellated and strongly compressed quite from <strong>the</strong> basis. CosttB thin, alternately unequal<br />
<strong>the</strong> larger ones ra<strong>the</strong>r prominent and somewhat lamellar. Calice arched and elongated in <strong>the</strong> proportion<br />
<strong>of</strong> 100:230. Septa thin, very closely set, and presenting on <strong>the</strong>ir lateral surfaces a great number <strong>of</strong><br />
granulations arranged somewhat regularly in convex lines parallel to <strong>the</strong> upper edge. Forty-eight principal<br />
septa, separated by an equal number <strong>of</strong> small ones ; some indications <strong>of</strong> an additional rudimentary cyclum.<br />
Height <strong>of</strong> <strong>the</strong> corallum, one inch and a half; long diameter <strong>of</strong> <strong>the</strong> calice, twelve lines ; short axis, five lines.<br />
(The figure given by Goldfuss, tab. xv, fig. 8, is not quite accurate.)<br />
Monogr. <strong>de</strong>s Astrei<strong>de</strong>s, loc.<br />
cit.<br />
Germ., vol. i, tab. xiii, fig. 2.<br />
''<br />
Catalogue <strong>of</strong> <strong>British</strong> Fossils, p. 40.