A monograph of the British fossil corals - kreidefossilien.de

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xvi BRITISH FOSSIL CORALS. 15. Genus Placocyathus. Milne Edw. and J. Hairae, loc. cit., p. 327, 1848. Corallum simple, pedicellate, and slightly compressed. Columella lamellar, with its apical margin straight. Pali thin, resembling lobes of the septa, and corresponding only to the septa of the pennltimate and antipenultimate cycla; those facing the latter more developed than the others (a disposition which forms an exception to the common rule). Septa numerous, thin, broad, and slightly exsert. Costce distinct from the top to the bottom of the walls, but projecting very little, nearly equal, and appearing to bifurcate towards the upper part of the corallum. Typ. sp., Placocyathits aperfus, Milne Edw. and J. Haime, loc. cit., tab. x, fig. 10. Second Tribe—TURBINOLIN^. MUne Edw. and J. Haime, loc. cit., p. 235, 1848. Corallum destitute of pali ; the septa extending to the columella, or meeting in the centre of the visceral chamber. ^ 1. Wall naked, or having only an incomplete epitheca. 16. Genus Turbinolia. TurbinoUa {in parte), Lamarck, An. sans Vert., vol. ii, p. 359, 1816 ; Turbinolia {in parte), Ehrenberg, op. cit., p. 53, 1834 ; Dana, op. cit., p. 3/4 ; Turbinolia, Milne Edw. and J. Haime, loc. cit., p. 235, 1848. Corallum simple, conical, straight, and presenting no trace of adherence. Calice circular. Columella styliform. Septa exsert, those of the last cyclum bent toward the neighbouring ones and united to them. Cosfce lamellar, straight, entire, and very projecting ; the intercostal grooves presenting a double series of small dimples, resembling pores. Typ. sp., TurbinoUa sulcata, Lamarck, Hist. Anim. sans Vert., vol. ii, p. 231 ; Cuvier and Brongniart, Geograpliie Mineral, des Envir. de Paris, tab. ii, fig. 3. 17. Gemis Sphenotrochus. Milne Edw. and J. Haime, loc. cit., p. 240, 1848. Corallum simple, presenting no trace of adherence, straight, and cuneiform. Calice elUptical. Columella lamellar, and occupying the great axis of the cahce ; its upper margin flexuous and bilobate. Septa broad, slightly exsert, and forming three cycla ; apparently twelve systems in the adult. Costce broad, not very prominent, in general crispate, or represented by series of papillous tubercles. Typ. sp., Sphenotrochus crispus, MOne Edw. and J. Haime, loc. cit., p. 241 ; Turbinolia crispa, Lamarck, op. cit., vol. ii, p. 231 ; Milne Edwards, Atlas du Regne Animal de Cuvier, Zooph., pi. Ixxxii, fig. 4.
; INTRODUCTION. xvii IS. Genus Platytrochus. Milne Edw. and J. Haime, loc. cit., p. 246, 1848. Corallura simple, straight, cuneiform, and presenting no trace of adherence. Calice elhpticaL Columella fasciculate, and terminated by papiOae. Septa exsert, very broad, nearly equal, and very strongly granulated; three cycla; systems equally developed. Costa of two sorts, those that occupy the middle of each side of the corallum enlarging as they ascend ; the lateral ones larger and nuich broader at their bases than near the calice, so as to render the lateral edges of the corallum almost parallel. Typ. sp., Platytrochus Stokesii, Milne Edw. and J. Haime, loc. cit. tab. vii, fig. 7 ; Turbinolia Stokesii, Lea, Contrib. to Geol., tab. vi, fig. 207. 19. Genus Ceratotrochus. Milne Edw. and J. Haime, loc. cit., p. 248, 1848. Corallum simple, subpediceUate, free in the adult state, and reciu^ved towards its basis. Calice circular, or nearly so. Columella fasciculate, and highly developed. Septa straight, broad, and exsert. Costce partly armed with spines, crests, or small lobular processes. Typ. sp., Ceratotrochus midtkerialis, Milne Edw. and J. Haime, loc. cit., tab. vii, fig. 5 ; TurhinoHa multiserialis, Michelotti, Spec. Zool. tab. ii, fig. 7. 20. Genus Discotrochus. Milne Edw. and J. Haime, loc. cit., p. 251, 1848. Corallum simple, discoidal, and presenting no trace of adherence. Calice circular, and almost flat. Columella fasciculate, and terminated by papillge equal in size. Septa straight, very broad, and projecting but little laterally. Wall horizontal. Costts straight and simple. Typ. sp., Discotrochus Orbignyarms, Milne Edw. and J. Haime, loc. cit., tab. vii, fig. 6. 21. Genus Desmophyllum. Ehrenberg, op. cit., p. 75, 1834. Corallum simple, and adherent by a broad basis. Calice with a very deep fossula. No columella (a character which distinguishes this group from all the preceding Turbinolinse). Septa broad, very exsert, free almost all along theii- inner edge, and grouped in fasciculse those of the last cyclum taller than those of the pemdtimate cyclnm, and cemented exteriorly to the older septa. Costce distinct near the calice, but obsolete on the lower part of the wall, where there are only a few granidations. Typ. sp., Besmophyllmn crista-galli, Milne Edw. and J. Haime, loc. cit., tab. vii, fig. 10.
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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 23 and 24: INTRODUCTION. xiii 3. Genus Acantho
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Page 29 and 30: INTRODUCTION. xix Aberrant Group. P
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Page 39 and 40: ; INTRODUCTION. xxix 23. Genus Pler
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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
Page 67 and 68: . INTRODUCTION. Ivii Second Tribe
Page 69 and 70: INTRODUCTION. lix 4. Genus Fistulip
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INTRODUCTION. kvii 7. Gejius Hallia
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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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