A monograph of the British fossil corals - kreidefossilien.de

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xviii BRITISH FOSSIL CORALS. § 2. WaU completely covered by a pellicular epitlieca. 22. Genus Flabellum. Lesson, Illustr. de Zoologie, 1831 ; Phyllodes, Philippi, Neues Jalirbuch fiir Miner. Geol. 1841. Corallum simple, compressed, and in general free in the adult state. Calice usually elliptic, very strongly arched in the direction of its long axis ; fossula narrow, and very deep. Columella spurious, and formed by marginal trabiculse of the septa ; very little developed, or even quite rudimentary. Sepia in general very numerous, appertaining in reality to six primitive systems, but forming in appearance a much greater number of systems ; not projecting above the margin of the wall, and presenting laterally regular rows of well-developed granulations. Walls completely covered with a thin, slightly-striated epitheca, and in general armed laterally with long spiniform processes, corresponding with the direction of the long axis of the calice. No radiciform appendices. Typ. sp., Flabellum pavoninum, Lesson, op. cit., pi. xiv. 23. Gem(s Placotrochus. MOne Edw. and J. Haime, loc. cit., p. 282, 1848. Corallum resembling much those of the preceding genus, but having a lamellar columella. Typ. sp., Placotrochus lavis, Milne Edw. and J. Haime, loc. cit., tab. viii, fig. 15. 24. Genus Blastotrochus. Milne Edw. and J. Haime, p. 282, 1848. Corallum resembling those of the genus Flabellum, but gemmiparous ; the young produced by buds placed along the lateral edges of the corallum, and becoming free by the progress of their development. Typ. sp., Blastotrochus nutrix, MUne Edw. and J. Haime, loc. cit., tab. viii, fig. 14. 25. Genus Rhizotrochus. Milne Edw. and J. Haime, loc. cit., p. 281, 1848. Corallum simple, trochoid, and adherent by means of cylindrical radiciform appendices, which proceed from the wall, at different heights, and descend to embrace the extraneous body on which the Zoophyte lives. Calice almost oval, with a very narrow and very deep fossula. No columella. Septa extending to the middle of the visceral chamber, where they unite without presenting any trabiculas. Typ. sp., Rhizotrochus typus, Milne Edw. and J. Haime, loc. cit., tab. 8, fig. 16.
INTRODUCTION. xix Aberrant Group. PSEUDOTURBINOLID^. Corallum simple, with the locuU open and devoid of synapticulse or dissepiments, as in Turbinohdae, but having the septa represented by groups of three vertical laminae, not adhering together, excepting near their external margin, where they are united by a common costa ; a mode of strucUu-e, which is quite anormal in the whole order of Zoantharia. Genus Dasmia. Milne Edw. and J. Haime, op. cit., p. 328, 1848. Corallum subtiu'binate, and appearing not to be free. SejJta strongly granulated. Costce thick, equal, not numerous, and separated by deep grooves. Tjrp. sp., Dasmia Sowei-bi/i, Milne Edw. and J. Haime, loc. cit., tab. vii, fig. 8. Family II. OCULINIDiE. Corallum composite, produced by gemmation, and presenting in general an abundant, compact ccenenchyma or common tissue, the sm-face of which is smooth, delicately striate near the calices, or shghtly granular, but never echinulate. Jraik of the corallites complete (that is to say, presenting no perforations), not distinct from the ccenenchyma, and increasing by then* internal surface, so as to invade progressively the inferior part of the visceral cavity, and to fill it up more or less completely in old age. Loculi imperfectly divided by a few dissepiments ; no synapticulse. Septa entii-e, or having their upper edge slightly divided. ^ 1 . Septa of various sizes, forming distinct cycla. 1. Gen?(S OcuLiNA. (Pars) Lamarck, Hist, des An. sans Vert., t. ii, p. 283, 1816; Milne Edw. and J. Haime, Comptes rend, de I'Ac. des Sc, t. x.xlx, p. 68, 1849. Corallum in general arborescent; gemmation irregular or affecting a spiral disposition ; ccenenchyma highly developed ; its smface smooth, excepting near the calices, where it presents slight radiating strioc. Corallites wth the calice very deep ; a columella well developed, papillose at its apex, and becoming compact towards its basis. Pali corresponding to all the septa, excepting those of the last cyclum. Septa almost entire, slightly exsert, and very unequally developed. Typ. sp., Oculina virginea, Lamarck, An. sans Vert., p. 289 ; Madrejwra virginea, Ellis and Sol., tab. xxxvi. 2. Gemis Trymhelia. Milne Edw. and J. Haime, Comptes rend, de I'Academie des Sciences, t. xxix, p. 68, 1849. Corallmn arborescent, differing from Oculina by the non-existence of a columella, and the great development of the ^jali, which are cemented together, so as to form a vertical tube. Typ. sp., Trymhelia eburnea, Milne Edw. and J. Haime, loc. cit., p. 68.
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Page 13 and 14: INTRODUCTION. iii centre of the ram
Page 15 and 16: INTRODUCTION. v certain parts of th
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Page 19 and 20: INTRODUCTION. ix Sub-class 1. CORAL
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Page 51 and 52: ; INTRODUCTION. xli 64. Genus Astro
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Page 59 and 60: INTRODUCTION. xlix 14. Genus Ctclos
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Page 63 and 64: INTRODUCTION. liii 7. Genus Stephan
Page 65 and 66: INTRODUCTION. Iv Family VII. PORITI
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INTRODUCTION. hix 17. Genus Gonioph
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INTRODUCTION. Ixxi or costal radii
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INTRODUCTION. • Ixxiii The genera
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INTRODUCTION. Ixxv Family I. ALCYON
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INTRODUCTION. Ixxvii Second Tribe
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INTRODUCTION. Ixxix 1 7. Ge?ius Dis
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INTRODUCTION. Ixxxi 8. Genus Soland
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INTRODUCTION. Ixxxiii 3. Ge7lUS ViR
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INTRODUCTION. Ixxxv Order 3. PODACT
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CORALS OF THE UPPER CHALK. 46 towar
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CORALS OF THE UPPER CHALK. 47 Famil
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: CORALS FROIM THE UPPER CHALK. 49
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CORALS FROM THE UPPER CHALK. 51 Tho
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CORALS FROM THE LOWER CHALK. 53 CHA
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CORALS FROM THE LOWER CHALK. 55 the
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CORALS FROM THE UPPER GREENSAND. 57
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; CORALS FROM THE UPPER GREENSAND.
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CORALS FROM THE GAULT. CHAPTER VI.
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; CORALS FROM THE GAULT. 03 3. Genu
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CORALS FROM THE GAULT. 65 found nea
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CX)RALS FROM THE GAULT. G7 and have
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' Petref. : ; CORALS FROM THE GAULT
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; CORALS FROM THE LOWER GREENSAND.
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TAB. IX. CORALS FROM THE UPPER CHAL
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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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