A monograph of the British fossil corals - kreidefossilien.de

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CORALS FROM THE LOWER CHALK. 55 the fifth order being rather longer than those of the fourth order. The septa of the fifth cyclum are small, thin, low, and unite to the neighbouring principal septa ; those of the sixth order join the primary ones ; those of the seventh order adhere by their inner and upper edge to the secondary ones, and those of the eighth and ninth orders to the tertiary septa ; or, in other words, each element of this fifth cyclum joins the eldest of the two septa between which it is placed. Lidependently of these junctions, which are normal, and always take place along the inner edge of the septa, the interseptal loculi are irregularly divided in some places by the projecting lateral granute of two neighbouring septa meeting, and becoming cemented together. By this character, as well as by its general form, this species tends to unite the family of Eupsammidse with the Fungidse. Height of the corallum, one and a half or two lines ; diameter, three or four lines. Some specimens, which were probably not adult, were only two lines and a half in diameter. This delicate little Coral differs from Stephanophyllia elegans, S. imperialis, and S. discoides^ by the form of the septa, which do not appear to be angular and lacerated, as in the three latter species. Stej}kanojj/ij/Uia astreata" differs fi'om it by having a large fossula and a well-developed columella. It most resembles 8. stiecica / but in this species the two tertiary septa of each system unite below the columella and the secondary septa, which consequently do not extend to the centre of the calice ; whereas in 8. Bowerbankii these tertiary septa, as we have ah'eady stated, adhere to the secondary septa, and these last-mentioned septa extend to the columella. The Fossil Coral figm'ed by M. von Hageuow, under the name of Ftmgia clathrata* and found by that geologist in the chalk formation of Rugen, is evidently very nearly allied to the British species here described ; but as far as we can judge of it by M. von Hagenow's engraving, it appears to differ from it by its more elevated form, by the strongly-marked concentric striae visible on the mural disc, and by its basis being more prominent. We must also remark, that the section of the genus Stephanophyllia, to which this species belongs, and to which we applied the name of Lenticular 8tephanophylUa^ has of 1 See our Monograph of the Eupsammidse, Ann. des So. Nat., S""" serie, vol. x. 2 Fimgia astreata, Goldfuss, Petref. Germ., vol. i, p. 47, tab. xiv, fig. 1 (where it is by mistake designated under the name of Fungia radiata). This species not having been, as yet, well characterised, we think it may be useful to give a short description of it here. Corallum simple, very short, and having the form of a plano-convex lens. Calicular fossula circular, and well developed. Costfe very delicate and not closely set. Septa forming five complete cycla, and appearing to be thin and strongly granulated. Size very variable ; in the adult, diameter three lines, height about one line. Fossil found at Aix-la-Chapelle, in Westphalia, and existing in the Museums of Bonn and Paris. All the specimens yet found are in a very bad state of preservation. * Monogr. of the Eupsammidae, loc. cit., p. 94. •* In Leonhard and Bronn's Jahrbuch fiir Mineralogie, 1840, p. 684, tab. ix, fig. 3. 5 Monogr. of the Eupsammidse, loc. cit., p. 94, 1848.
56 BRITISH FOSSIL CORALS. late been considered by M. Alcide d'Orbigny as deserving to be elevated to the rank of a genus, and has been named by that author Discopsammia ;^ but M. d'Orbigny has not pointed out any new characters in addition to those on which this separation was primitively established in our Monograph, and consequently we see no reason for altering the classification previously adopted. Stephanophyllia Bowerbankii is found in the lower chalk near Dover, and does not appear to differ from some corals which one of us" has lately met with in a bed of chlorited chalk at Orcher, near le Havre. The specimens here described belong to the collections of Mr. Bowerbank, Mr. D. Sharpe, and the Geological Society. ^ Note sur les Polypiers Fossiles, p. 10, 1849. - M. Jules Hairae.
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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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INTRODUCTION. xxvii in the two prec
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; INTRODUCTION. xxix 23. Genus Pler
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; INTRODUCTION. xxxi 30. Genus Hete
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INTRODUCTION. xxxiii 30. Genm Symph
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;; INTRODUCTION. xxxv 44. Gentts Tr
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LNTRODUCTION. xxxvii 50. Genus Dipl
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INTRODUCTION. xxxix Section IV.—
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; INTRODUCTION. xli 64. Genus Astro
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INTRODUCTION. xliii which thus form
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; INTRODUCTION. xlv 79. Genus Oclan
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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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Page 73 and 74: INTRODUCTION. Ixiii Family X. SERIA
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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
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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 110 and 111: CORALS FROM THE UPPER GREENSAND. 57
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Page 114 and 115: CORALS FROM THE GAULT. CHAPTER VI.
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Page 118 and 119: CORALS FROM THE GAULT. 65 found nea
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Page 142 and 143: 302 TABLE OF BRITISH FOSSIL CORALS.
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Page 152 and 153: 312 GENERAL INDEX. Dendrophyllia de
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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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A monograph of the British fossil corals - kreidefossilien.de

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