A monograph of the British fossil corals - kreidefossilien.de

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xlii BRITISH FOSSIL CORALS. indistinctly separated by superficial, narrow grooves. Columella not much developed at its apex ; but having a tendency to become compact, and to fill up the visceral chamber towards its basis. Sejjfa very thick, closely set, scarcely granulated, and very feebly denticulated. Dissepiments little developed. Typ. sp., Baryastrea solida, Milne Edw. and J. Hainie, loc. cit. 68. Genus Acanthastrea. Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 495, 1848. Corallum forming a slightly convex mass, with its upper surface strongly echinulate, and its under surface constituting a plate, covered with a complete, thin epitheca. Genuuation sub-marginal or marginal. CoraUifes united by their walls, which are somewhat cellular. Calices sub-polygonal, with broad, spiniferous, simple, common margins. Columella rudimentary or septal. Septa exsert, strong, and armed with projecting spiniform teeth, the largest of which are situated near the walls, instead of being the central ones, as in the preceding genera. Dissepiments very numerous. Typ. sp., Acanthastrea spinosa, Milne Edw. and J. Hainie, Comptes rend., t. xxvii, p. 495. 69. Genus Synastkea. Milne Edw. and J. Hainie, Comptes rend., t. xxvii, p. 495, 1848. Corallum pediculate, and increasing in breadth more than in height. Gemmation sub-mai'ginal. Corallites intimately united by their walls. Calices superficial, distinct at their centre, but not so towards their cu'cumference. Columella very small. Septa confluent, progressing from one calicular centre to another without interruption, exsert, and hiding the walls, over which they extend ; their calicular margin almost horizontal, and armed with nearly equal teeth. Typ. sp., Synastrea Savignyi, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3"" serie, vol. x, tab. ix, fig. 12. 70. Genus Thamnastrea. Thamnasteria {in j)arte), Le Sauvage, M^m. de la Soc. d'Hist. Nat. de Paris, vol. i, p. 241, 1822; Thamnastrea, ejusd., Ann. des Sc. Nat., 1" serie, vol. .xxvi, p. 328. Corallum having confluent septa, and most of the other characters of Synastrea, but forming a fascicidus of columns or thick branches, erect, and of a more or less arborescent aspect. Typ. sp., Thamnastrea dendroidea, Le Sauvage, Mem. de la Soc. d'Hist. Nat., vol. i, tab. xiv. 71. Genus Goniastrea. Milne Edw. and J. Haime, Comptes rend., t. x.xvii, p. 495, 1848. Corallum always increasing by successive fissiparity, and forming a convex or lobulated mass, of a dense structure. Corallites intimately united from top to bottom by their walls,
INTRODUCTION. xliii which thus form simple partitions between the visceral cavities, and are thick and com|)act. Calices polygonal ; fossula rather deep. Columella spongy. Sepki slightly exsert, their apex arched and denticulated. Well-characterised, denticulated pall, corresponding to all the septa, except those of the last cyclum. Typ. sp., Goniastrea solida, Milne Edw. and J. Haime, Ann., 3"' serie, t. x, pi. ix, fig. 7 ; Madrepora solida, var. h, Forskal, Descr. Anim. in Itin. Orient., p. 131. 72. Genus Aphrastrea. Milne Edw. and J. Hairae, Comptes rend., t. xxvii, p. 495, 1848. Corallum increasing by fissiparity, and forming a convex mass of a light cellular structure, presenting on its under surface a complete, common epitheca. Calices intimately imited by their margins, which thus assume the appearance of simple partitions. Columella spongy. Pali or paliform lobes of the septa corresponding to all the cycla, except the last. Septa denticulated, shghtly exsert. Bissepimcnts vesicular, and highly developed. Walls extremely thick, and completely vesicular. Typ. sp., Aphrastrea deformis, Milne Edw. and J. Haime, Ann. des So. Nat., 3"" serie, vol. x, tab. ix, fig. 11 ; Astrea deformis, Lamarck, Hist, des An. sans Vert., t. xi, p. 2G4. 73. Gemis Parastrea. Mdne Edw. and J. Hairae, Comptes rend., t. xxvii, p. 495, 1848. Corallum increasing by fissiparity, and having the same general form as in the preceding genus, but differing from it by the mode of union of the corallites, which takes place by means of the costae and their dissepiments, so that the calices, instead of being separated only by a common simple margin, have each a distinct margin independent of those surromicUng it. Septa exsert, and armed wdth teeth, the largest of which are placed near the centre of the calice, and often assume the appearance of pali. Dissepiments well developed. Typ. sp., Parastrea amivonim, Milne Edw. and J. Hairae, Ann., 3"" serie, vol. x, pi. ix, fig. 9. Section v.—ASTREIN^ REPTANTES. Corallum increasing by the development of buds on stolons, or on membraniform basal expansions. The corallites not united by their sides, excepting accidentally by means of their walls, and remaining short. Septa feebly denticulated. Dissepiments almost rudimentary. 74. Genus Angia. Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 496, 1848. Corallum composed of short, cylindrical corallites, united by a common gemmiferous basal expansion, and completely free laterally. Calices sub-circular ; fossula broad and
Page 5: THE PALiEONTOGRAPHICAL SOCIETY. INS
Page 8 and 9: i. E. ADLJIED, PBINTr.B, BARTHOLOME
Page 10: e 7b-^,pi'? PRINTED BY C. AND .1. A
Page 13 and 14: INTRODUCTION. iii centre of the ram
Page 15 and 16: INTRODUCTION. v certain parts of th
Page 17 and 18: INTRODUCTION. vii in which the mult
Page 19 and 20: INTRODUCTION. ix Sub-class 1. CORAL
Page 21 and 22: ; INTRODUCTION. xi Sub-order 1. ZOA
Page 23 and 24: INTRODUCTION. xiii 3. Genus Acantho
Page 25 and 26: ; INTRODUCTION. xv formed by proces
Page 27 and 28: ; INTRODUCTION. xvii IS. Genus Plat
Page 29 and 30: INTRODUCTION. xix Aberrant Group. P
Page 31 and 32: INTRODUCTION. xxi 8. Genus Amphelia
Page 33 and 34: INTRODUCTION. xxiii 3. Genus Dkndra
Page 35 and 36: INTRODUCTION. xxv 5. Genus Ccelosmi
Page 37 and 38: INTRODUCTION. xxvii in the two prec
Page 39 and 40: ; INTRODUCTION. xxix 23. Genus Pler
Page 41 and 42: ; INTRODUCTION. xxxi 30. Genus Hete
Page 43 and 44: INTRODUCTION. xxxiii 30. Genm Symph
Page 45 and 46: ;; INTRODUCTION. xxxv 44. Gentts Tr
Page 47 and 48: LNTRODUCTION. xxxvii 50. Genus Dipl
Page 49 and 50: INTRODUCTION. xxxix Section IV.—
Page 51: ; INTRODUCTION. xli 64. Genus Astro
Page 55 and 56: ; INTRODUCTION. xlv 79. Genus Oclan
Page 57 and 58: INTRODUCTION. xlvii 4. Genus Micbab
Page 59 and 60: INTRODUCTION. xlix 14. Genus Ctclos
Page 61 and 62: INTRODUCTION. li the sclerenchyma,
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
Page 71 and 72: INTRODUCTION. hi but much shorter,
Page 73 and 74: INTRODUCTION. Ixiii Family X. SERIA
Page 75 and 76: ; INTRODUCTION. Ixv Family XIII. CY
Page 77 and 78: INTRODUCTION. kvii 7. Gejius Hallia
Page 79 and 80: INTRODUCTION. hix 17. Genus Gonioph
Page 81 and 82: INTRODUCTION. Ixxi or costal radii
Page 83 and 84: INTRODUCTION. • Ixxiii The genera
Page 85 and 86: INTRODUCTION. Ixxv Family I. ALCYON
Page 87 and 88: INTRODUCTION. Ixxvii Second Tribe
Page 89 and 90: INTRODUCTION. Ixxix 1 7. Ge?ius Dis
Page 91 and 92: INTRODUCTION. Ixxxi 8. Genus Soland
Page 93 and 94: INTRODUCTION. Ixxxiii 3. Ge7lUS ViR
Page 95: INTRODUCTION. Ixxxv Order 3. PODACT
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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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