A monograph of the British fossil corals - kreidefossilien.de

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CORALS OF THE UPPER CHALK. 47 Family ASTREID^ (p. xxiii). Tribe EUSMILIN^ (p. xxiii). 1. Genus Parasmilia (p. xxiv). 1. Parasmilia centralis. Tab. VHI, figs. 1, la, 16, Ic. Madeeporite, Parkinson, Organ. Remains of
48 BRITISH FOSSIL CORALS. very slightly flexuous, and presenting laterally a few large granulations. Lissephnents simple, almost horizontal, and few in number ; about three from the top to the bottom of each principal septum, as may be seen by means of a vertical section. Height varying from one to two inches ; diameter of the calice, four lines ; depth of the fossula, two lines. The genus Parasmilia, circumscribed within the limits assigned to it in the Introduction to this Monograph, only contains seven species, all of which belong exclusively to the upper beds of the Chalk Formations. Three of them (P. centralis, P. Gravesiana, and P. ehngatd) have already been described in our Monograph of the Astreidse,^ and the four others (P. MantelUi, P. Fittonii, P. cylindrica, and P. serpentina) will be made known in the present work. They all differ but little from each other, and in order to recognise them, it is necessary that they should be compared together \d\\\ attention. P. centralis, which may be considered as the type of this small generic group, differs from P. Gravesiana, P. elongata, P. cylindrica, and P. MantelUi, by its costse being always straight, rather thick and never sub-lamellous, and rather flexuous, as in the four last-mentioned species ; it is also to be remarked, that its costae are rather more prominent near the basis than higher up, whereas the contrary is seen in the P. Gravesiana, and that the loculi are never subdivided by small dissepiments, as is the case in P. elongata, P. cylindrica, and P. MantelUi. P. serpentina, which bears more resemblance to it, is characterised by the septa forming only three cycla, and the costae being very delicate, and rather indistinct towards the basis. But it is with P. Fittonii that P. centralis is most closely allied ; the former, however, is of a thicker form, its tertiary costse are more developed and more delicately granulated, and its columella is much larger, and terminated by a sub-papillose surface. The specimens of P. centralis which we had the opportunity of examining were found in the Upper Chalk at Northfleet, near Gravesend, and at Norwich. Mr. Phillips mentions the existence of the same fossil at Dane's Dike;^ and Dr. Mantell has met with it at Brighton, Lewes/ Steyning, and Heytesbury.* Mr. Graves also alludes to it as being found in the Challc Formation of the Parisian basin at Beauvais / but we have much reason to think that the species observed by that geologist is not the one here described, and must be referred to our P. Gravesiana. M. Roemer and other authors equally apply the name of C. centralis^ to a fossil found in the north-west of Germany, but we have not been able as yet to verify the propriety of this determination, not having seen any of the specimens discovered in that part of the Continent. ^ The species described in that work under the names of Parasmilia pocuhim, P. Faitjasii, and P. punctata, must now be referred to our genus Coelosmilia, which is characterised by the entire absence of the cohimella. - Op. cit., parti, p. 119. ^ lUygt^ ^f tj^g Geol. of Sussex, p. ICO. * Geol. Trans., 2d series, vol. iii, p. 204, ^ Geogn. de I'Oise, p. 701. 8 Versteinerungen des Norddeutschen Kreidebirges, p. 26.
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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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Page 51 and 52: ; INTRODUCTION. xli 64. Genus Astro
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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
Page 98 and 99: CORALS OF THE UPPER CHALK. 46 towar
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
Page 124: ; CORALS FROM THE LOWER GREENSAND.
Page 130: TAB. IX. CORALS FROM THE UPPER CHAL
Page 138: TAB. XI. CORALS FROM THE GAULT. Cya
Page 142 and 143: 302 TABLE OF BRITISH FOSSIL CORALS.
Page 144 and 145: 304 TABLE OF BRITISH FOSSIL CORALS.
Page 146 and 147: A. GENERAL INDEX;
Page 148 and 149: 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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