A monograph of the British fossil corals - kreidefossilien.de

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' Petref. : ; CORALS FROM THE GAULT. 69 beut in two ; from T. Boissyana, T. Patula} T. cernua, and T. crassa,' by being subpedicellated, and not adherent in the adult state ; from T. irregularis, T. corniculum, T. Faujasii, T. GervuUii, and T. uricornis? by being strongly compressed quite down to the basis and from T. Saltzhuryiensis, T. cuneolus, T. compressa, T. complanata, T. Basochesii, and T. fuherosu, by the existence of the above-mentioned four deep mural fm'rows. By theii- general form, all these corals much resemble many species belonging to the division of Cyathininae, but diflFer from them, and from all other Turbinolidse, by having interseptal dissepiments. This fossil was found in the Gault at Folkstone, Ijy Mr. Bowerbank. The LiTHODENDRON GBACiLE, Goldfuss/ is mentioned by Mr. Morris^ as having been found in the Gault of Kent, but as yet we have not met with any specimens of that species in any of the British palaeontological collections. 1 See our Monogr. des Astreides, Aun. des Sc. Nat., 3"''serie, vol. x, p. 236. - We here designate, under the name of Trochosmilia ci-assa, the fossil described by M. Michelin under the name of Turbinolia cernua, Goldfuss, and by ourselves as TrochosmiHa cernua ; for, on comparing it with the specimens previously described by Goldfuss under the name of Turbinolia cernua, we have ascertained that they are not specifically identical. The species which must retain the name first applied by Goldfuss presents the following characters Corallum pedicellated and strongly compressed quite from the basis. CosttB thin, alternately unequal the larger ones rather prominent and somewhat lamellar. Calice arched and elongated in the proportion of 100:230. Septa thin, very closely set, and presenting on their lateral surfaces a great number of granulations arranged somewhat regularly in convex lines parallel to the upper edge. Forty-eight principal septa, separated by an equal number of small ones ; some indications of an additional rudimentary cyclum. Height of the corallum, one inch and a half; long diameter of the calice, twelve lines ; short axis, five lines. (The figure given by Goldfuss, tab. xv, fig. 8, is not quite accurate.) Monogr. des Astreides, loc. cit. Germ., vol. i, tab. xiii, fig. 2. '' Catalogue of British Fossils, p. 40.
70 BRITISH FOSSIL CORALS. CHAPTER Vll. CORALS FROM THE LOWER GREEN SAND. The remains of true Polypi are very rare in this part of the British geological strata the fossil which Mr. Lonsdale has lately described under the name of Choristopetalum impar} and which was found in the lower greensand at Atherfield, does not appear to us to belong to this class, and is, in om- opinion, a Bryozoon. We have as yet met with but one species of Zoantharia, which can be referred with any degree of certainty to this formation. Family STAURID^ (p. Ixiv). Genus Holocystis (p. Ixiv). HoLOCYSTis ELEGANS. Tab. X, fig. 5, 5 a, 5 b. AsTREA, Fitton, On the Strata bL4o\v the Chalk, in GeoL Trans., s. 2, vol. iv, p. 352, 1843. AsTREA ELEGANS, Fitton, in Quarterly Journ. Geol. Soc, voL iii, p. 296, 18-17. Cyatiiopiiora (?) ELEGANS, Lonsdale, Proceed, of the Geol. Soc., vol. v, part i, p. 83, tab. iv, fig. 12, 15, 1849. Corallum complex, astreiform, constituting a convex mass, and augmenting by extra calicular gemmation ; the young individuals being produced at the point of junction of the surrounding calices. Corallifes somewhat prismatic, and cemented together laterally, either by the direct union of their walls, or by means of the costas, which are thick, and in general pretty well developed. Calices subpolygonal, separated in general by a simple but thick mural ridge ; sometimes by walls that remain distinct, and are in their turn separated by a small intermm'al furrow. Fossula deep. Columella very small, and appearing to be styliform. Sejifa forming three complete cycla, and four well-characterised systems. The four primary ones much more developed than the others, reaching almost to the centre of the fossula, and giving to the calice a crucial character, which is never met with in Astreidte, Oculinidse, Turbinolidse, &c. The septa are slightly exsert, closely set, thick exteriorly, and very slightly granulated laterally ; they appear to have undivided edges, and they differ much in size, according to the cycla to Avhich they belong. The interseptal dissepimetth are simple, horizontal, or slightly convex, and jjlaced at the same level in the different loculi, 1 Proceedings of the Geol. Soc, vol. v, part i, p. ()9, tab. iv, figs. 5 to 11, 1849.
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THE PALiEONTOGRAPHICAL SOCIETY. INS
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i. E. ADLJIED, PBINTr.B, BARTHOLOME
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e 7b-^,pi'? PRINTED BY C. AND .1. A
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INTRODUCTION. iii centre of the ram
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INTRODUCTION. v certain parts of th
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INTRODUCTION. vii in which the mult
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INTRODUCTION. ix Sub-class 1. CORAL
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; INTRODUCTION. xi Sub-order 1. ZOA
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INTRODUCTION. xiii 3. Genus Acantho
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; INTRODUCTION. xv formed by proces
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; INTRODUCTION. xvii IS. Genus Plat
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INTRODUCTION. xix Aberrant Group. P
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INTRODUCTION. xxi 8. Genus Amphelia
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INTRODUCTION. xxiii 3. Genus Dkndra
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INTRODUCTION. xxv 5. Genus Ccelosmi
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INTRODUCTION. xxvii in the two prec
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; INTRODUCTION. xxix 23. Genus Pler
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; INTRODUCTION. xxxi 30. Genus Hete
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INTRODUCTION. xxxiii 30. Genm Symph
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;; INTRODUCTION. xxxv 44. Gentts Tr
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LNTRODUCTION. xxxvii 50. Genus Dipl
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INTRODUCTION. xxxix Section IV.—
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; INTRODUCTION. xli 64. Genus Astro
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INTRODUCTION. xliii which thus form
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; INTRODUCTION. xlv 79. Genus Oclan
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INTRODUCTION. xlvii 4. Genus Micbab
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INTRODUCTION. xlix 14. Genus Ctclos
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INTRODUCTION. li the sclerenchyma,
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INTRODUCTION. liii 7. Genus Stephan
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INTRODUCTION. Iv Family VII. PORITI
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. INTRODUCTION. Ivii Second Tribe
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INTRODUCTION. lix 4. Genus Fistulip
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