A monograph of the British fossil corals - kreidefossilien.de

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Ixxviii BRITISH FOSSIL CORALS. 12. Genus Xenia. Savigny, Egypte, Atlas and op., Lamarck, op. cit., vol. ii, p. 629, 1816. Polypi forming subramified masses, as in Alcyonium, but not retractile, and not having a thick coating of spiciilcE at the basis of the tentacula. Typ. sp. Xenia umbellata, Savigny, Egypte, Polyp., tab. i, fig. 3. 13. Genus Nephthya. Savigny, Atlas de I'Egypte; Blainville, Manuel d'Actinol, p. 523; Spoggodes, Lesson, lUustr. de Zoologie, 1831. Polypi forming arborescent masses, incompletely retractile, and having the borders of the calice thick and incrustated with large navicular spiculse. Typ. sp„ Nephthya Chalroli, Audouin, ap. Savigny, Egypte, Pol. tab. ii. fig. 5. 14. Genus Paralctonium. Alcyonidia, Milne Edwards, Ann. des Sc. Nat. 2d series, vol. iv, p. 323. Polypi resembling Nephthya, but being completely retractile, and having the lower part of the common mass incrustated with a thick coating of long navicular spicula>, but the upper part membranaceous and retractile, Typ. sp., Paraleyonium elegans ; Alcyonidia elegans, Milne Edwards, loc. cit., tab. xii and xiii. 15. Genus Sarcophyton. Lesson, Zoologie du Voyage de la Coquille, Zooph., p. 92, 1831. Differs from the genus Alcyonium by the great abundance and the peculiar structure of the common tissue, the cells of which are tubular, and arranged with great regularity in fasciculi, perpendicularly to the upper surface of the mass. Typ. sp., Sarcophyton plicatum, Valenciennes MSS. ; Sarcophyton lobulatum. Lesson, loc. cit. ; Alcyonium plicaium, Lamarck, Hist, des An. sans Verteb., vol. ii, p. 395. 16. Genus Cespitularia. Valenciennes MSS. Polypi non-retractile, arranged in fascicidi, and united in the greatest part of their length by a dense, tough, common tissue, as in Alcyonium. Typ. sp., Cespitularia tmdtipinnata, Valen. ; Cornularia multipinnata, Quoy and Gaimard, Voyage de I'Astrolabe, Zooph., tab. .x.xii, figs. 1-4.
INTRODUCTION. Ixxix 1 7. Ge?ius DisTicHOPOBA ? Lamarck, loc. cit., p. 197. This singular zoophyte appears to have more affinity to Alcyouium than to any other form of polypi ; but the place belonging to it in a natural system of classification is as yet very uncertain. It is characterised by a calcareous, dendroid corallum, composed of long tubular cells, that present no traces of septa or tubulas, and are disposed in a flabellate manner, so as to constitute a vertical plane, the two sides of which are covered with a thick and compact coenenchyma, and the edge assumes the appearance of a calicidar groove, limited laterally by two rows of circular pores. Nothing is known concerning the structure of the soft parts. Typ. sp., Distichopora violacea, Lamarck, op. cit., p. 305. (For the structure of the Corallum, see Milne Edwards, Atlas du Regne Animal de Cuvier, Zooph., tab. lx.\xv, fig. 4.) Family II. GORGONIDiE. Poll/piers corticiferes, Lamarck, Hist, des Anim. sans Verteb. vol. ii, p. 288, 1816 ; Polypes corticaux, Cuvier, Regne Animal, vol. iv, p. 78, 1817; Corallia, Blainville, Manuel d'Actinologie, p. 501, 1834; Cerato-corallia, Ehrenberg, Corall. des Roth. Meeres, 1834 ; CoralliadcB, Gray, Synop. Brit. Mus. p. 134 ; GorgoniadcE, Johnston, British Zooph., p. 182, 1838; Gorffonida, Dana, Exploring Expedition, Zooph., p. 637, 1846 ; GorgoniadtB, Gray, List of British Anim. of the British Museum, p. 55, 1848. Polypi provided with a thick, suberous coenenchyma, surrounding a central stem that is adherent to an extraneous body by its basis, and is formed of epidermic sclerenchyma. Fii-st Tribe—GORGONINiE. Gorgonia, Pallas, Elenchus Zoophytorum, p. 160, 1766 ; Cuvier, Regne Animal, 1st ed., vol. iv, p. 80; Lamarck, Hist, des Anim. sans Verteb., vol. ii, p. 309 ; Gorgonince, Dana, Exploring Expedition, Zooph., p. 641, 1846. Common axis inarticulate, horny or fasciculate, but not calcareous. ] . Genus Gorgonia. Pallas, loc. cit., (in parte.) Axis corneous. Calices disposed irregularly round the ramified cylinders formed by the coenenchyma, and not encircled by imbricated squammaj. Pohjpi retractile. Typ. sp., Gorgonia tuberculata, Esper. Pflanz., Gorg., tab. xxxvii.
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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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Page 85 and 86: INTRODUCTION. Ixxv Family I. ALCYON
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TAB. XI. CORALS FROM THE GAULT. Cya
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302 TABLE OF BRITISH FOSSIL CORALS.
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304 TABLE OF BRITISH FOSSIL CORALS.
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A. GENERAL INDEX;
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308 GENERAL INDEX.
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310 GENERAL INDEX.
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312 GENERAL INDEX. Dendrophyllia de
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314 GENERAL INDEX. . Halysites cate
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310 GENERAL INDEX.
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318 GENERAL INDEX.
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320 GENERAL INDEX.
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322 GENERAL INDEX. Xenia Zaphrentis
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