A monograph of the British fossil corals - kreidefossilien.de

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Ixiv BRITISH FOSSIL CORALS. Sub-order 4. ZOANTHARIA RUGOSA. Corallum simple or composite, with a septal apparatus never forming six distinct systems, as in all the preceding Zoantharia, but appearing to be derived from four primary elements. Sometimes this disposition is rendered manifest by the existence of four wellcharacterised primary septa, or of an equal number of depressions occupying the bottom of the calice, and assuming a crucial appearance : in other cases only one of these primary septa or excavations is well developed so as to interrupt the radiate form of the system ; and in others, again, no trace of septal groups can be discovered, and the whole apparatus is represented by numerous equally developed radiate stria? rising on the surface of the tabidse, and extending up the inner side of the walls. The corallites are always perfectly distinct, and are never united by means of a coenenchyma ; nor do they ever form linear series, \vhich is often the case in the preceding sections. They multiply by gemmation, and the reproductive buds are in general developed on the sm-face of the caUces of the parents : this often arrests the growth of the latter, and gives rise to a superposition of generations. It is also to be noted that the septa, although in general very incomplete, are never porous, and never bear syuapticute, but that the visceral chamber is in general filled up from the bottom by a series of transverse tabulce, or by a vesicular structure, which often constitutes the principal part of the corallum. Family XII. STAURID^. Corallum with well-developed septa, extending without any interruption from the bottom to the top of the visceral chamber, united by lamellar dissepiments, and arranged in fom* systems, characterised by an equal number of large primary septa. 1. Gemis Stauria. Corallum composite, massive, astreiform, and increasing by calicular gemmation. CoraUitea united by then- walls, or free in part, and not presenting any costce. Sepia large, and with undivided edges, united along the axis of the visceral chamber. No columella. Typ. sp., Staitria astreiformis, nob. 2. Gemis Holoctstis. Lonsdale, in the Quarterly Journal of the Geol. Soc. of London, vol. v, part i, p. 83, 1849. Corallum composite, massive, astreiform, and increasing by extra-calicular Corallites united by means of weU-developed cost
; INTRODUCTION. Ixv Family XIII. CYATHAXONID^. Corallum with well-developed, complete sq)ta, which extend without interruption from the bottom to the top of the visceral chamber, and not forming a regular radiate circle those of the primary cyclum not much larger than the others, and not forming a fourbranched cross, as in the Stauridas ; one well-characterised septal fossula. No dissepiments nor tabulae. , Genus Cyathaxonia. Michelin, Icon. Zooph., p. 258, 1846. Corallum simple. Calice deep. Columella styliform, strong, and very prominent. Septa extending to the columella ; the place of one of them occupied by a deep depression or septal fossula. Typ. sp., Cyathaxonia cormi, Miclielin, loc. cit., p, 258, pi. lix, fig. 9. Family XIV. CYATHOPHYLLID^. Corallum with incomplete septa, that do not extend from the bottom to the top of visceral chamber, in the form of uninterrupted laminae ; the those of the primary cyclum similar to the others, and not forming a central four-branched cross. Septal fossulaj varying in number and in size. Visceral chamber divided by a series of superposed tabula;. First Tribe—ZAPHRENTIN^. A single septal fossula, well developed, or replaced by a sulcus or a crestiform process, and occasioning more or less irregularity in the radiate arrangement of the septal apparatus. The corallum is simple, and free in all the known species. 1. Genus Zaphrentis. Rafinesque and Clifford, Ann. des Sciences physiques de Bruxelles, vol. v, p. 2.'i4, 1820; Caninia, Michelin, Diet, des Sc. Nat., Supplem., vol. i, p. 485 ; Siphonojihyllia, Scouler, in M'Coy's Carbonif. Foss. of Ireland, p. 187, 1844. Corallum simple and trochoid. Calice deep. Septal fossula strongly developed, and occupying the place of one of the septa. No columella. Tabulce moderately developed, and bearing on their upper smface a series of septa, which extend from the wall to the centre of the visceral chamber, and are denticulate all along their calicular edge. Typ. sp., Zaphrentis patula ; Caninia palula, Michelin, Icon. Zoopb., tab. lix, fig. 4.
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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
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 and 52: ; INTRODUCTION. xli 64. Genus Astro
Page 53 and 54: INTRODUCTION. xliii which thus form
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: INTRODUCTION. Ixiii Family X. SERIA
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
Page 98 and 99: CORALS OF THE UPPER CHALK. 46 towar
Page 100 and 101: CORALS OF THE UPPER CHALK. 47 Famil
Page 102 and 103: : CORALS FROIM THE UPPER CHALK. 49
Page 104 and 105: CORALS FROM THE UPPER CHALK. 51 Tho
Page 106 and 107: CORALS FROM THE LOWER CHALK. 53 CHA
Page 108 and 109: CORALS FROM THE LOWER CHALK. 55 the
Page 110 and 111: CORALS FROM THE UPPER GREENSAND. 57
Page 112 and 113: ; CORALS FROM THE UPPER GREENSAND.
Page 114 and 115: CORALS FROM THE GAULT. CHAPTER VI.
Page 116 and 117: ; CORALS FROM THE GAULT. 03 3. Genu
Page 118 and 119: CORALS FROM THE GAULT. 65 found nea
Page 120 and 121: CX)RALS FROM THE GAULT. G7 and have
Page 122 and 123: ' 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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