A monograph of the British fossil corals - kreidefossilien.de

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CORALS FROM THE GAULT. 65 found near Cambridge, in England ; at Gatis de Gerodot, Dienville, near Brienne (department of the Aude), and Etrepy (department of the Marne), in France. Other specimens, which in all probability belong also to this species, are designated in M. Michelin's collection as having been found at Novion-en-Porcien ; at IMacheromenil, in the Ardennes, and at the Perte du Rhone, in the department of the Ain ; but we suspect that some mistake may have been made in the labelhng of the specimen which is designated in the same collection as belonging to the chalk of Toiunay, in Belgium. We must also add, that the fossil designated by Professor J. Phillips under the name of Turhinolia conulus was found by that eminent geologist at Speeton, in Yorkshire ; but its characters are not sufficiently well known for us to be able to identify it with the above-described species, specimens of which exist in the collections of the Geological Society, of the Museum at Paris, and of MM. d'Orbigny, Michelin, and Milne Edwards. • M. Al. d'Orbigny has lately given the name of Aplocyathus' to those species of our genus Trochocyathus in which the cahce is circular. If this new generic division was adopted, the species here described would be referred to it ; but that is not, in om* opinion, advisable. The calice, which is quite cii'cular in a great many species of om- genus Trochocyathus, becomes slightly elongated in some, quite elliptical in others, and not only would the line of separation be difficult to establish between these different forms, but certain species which are evidently most closely allied by all their other organic characters, would be separated generically in the classification proposed by M. d'Orbigny. We camiot, therefore, adopt his views in this respect ; but, in justice to that distinguished palccontologist, we must remark that the species" chosen by him as the type of his genus Jj)Ioci/afJiiis difiers much in its general aspect from most species of our genus Trochocyathus, and, when more completely known, may be found to present characters of sufficient value to authorise the establishment of a separate generic group, which must then be so defined as not to comprehend T. conulus, nor most of the other species that have a circular calice. 2. Trocuocyathus Harveyantjs. Tab. XI, fig. 4, 4 a, 4 b. Trochocyathus Harveyantjs, Milne Edwards and J. Haime, Monogr. des Turbinolides, in Ann. des Sc. Nat., 3"" serie, vol. ix, p. 314, 1848, Corallum simple, straight, short, almost hemispherical, and terminated by a very short peduncle, the basal surface of which is concave. Costce distinct from the basis, and delicately striated transversely ; the primary and secondary ones very prominent and sharp ; those of the third cyclum well developed along the upper half of the wall, but those of the fourth cyclum very small and obscure. Calice cii'cular and fiat; fossula shallow. Colmndla well developed and papillose. Se2Aa forming four complete cycla ; exsert, thin, ' Note sur des Pulypiers Fossiles, p. 5, 1849. - The Trochocyathus armatus. 9
66 BRITISH FOSSIL CORALS. broad, straight, graniJated laterally, unequally developed, but not differing ranch in the first and second cycla. Pali corresponding to the septa of the first three cycla, rather narrow, and unequally developed in an inverse tatio to the corresponding septa ; no pali in the radii of the septa belonging to the fourth cyclum. Height of the corallum, three lines diameter of the calice, four lines. This species belongs to the fourth section of our genus Trochocyathus (T. breves), and consequently its characters need not be compared with those of the various species belonging to the sections of the T. simplices, T. cristati, and T. muUistriati, the description of which may be found in our Monograph ' of the Turbinolidae.' It differs from T. obesus, T. armatus, and T. perannatus} by not having any costal spines, and from T. Michelini by the costae being distinct down to the basis, and by its general form being less depressed. It appears to be most closely allied to the fossil which we shall next describe under the name of Trochocyathus (?) Koniffi, but is of a more slender form. T. Harveyamis was found in the Gault at Folkstone, the birthplace of the illustrious physiologist to whom we ha\'e dedicated this species. The specimens here described belong to the collections of Mr. Bowerbank and Mr. D. Sharpe. 3. Trochocyathus (?) Konigi. Ti:rbinolia Konigi, Mantell, lUust. of the Geol. of Sussex, p. 85, tab. xi.\, figs. 22, 2-J, 1822. — — Fleming, British Animals, p. 510, 1828. — (trochocyathus?) Konigi, Milne Edwards and J. Haime, Monogr. des Turb., in Ann. des Sc. Nat., 3"" serie, vol. ix, p. 335, 1848. The specimens of this fossil figured by Mr. Mantell, and those which we have seen in the collections of ]\IM. d'Orbigny and Michelin, are in a very bad state of preservation, ^ This species, which has been lately designated under the name of Turbinolia perarmata by M. Talavignes, but has not yet been described, and has been given to us by that geologist, was discovered at Fabresan, in the department of the Aude. M. Alex. Rouault has since then met with the same species at Bos d'Arros in the Lower Pyrennees. (See Bull. Soc. Geol., 2""" serie, vol. v, p. 206.) It may be recognised by the following characters : Corallum very short, subdiscoidal ; its under surface flat and almost smooth ; sometimes adhering to a small shell. Costa distinct near the calice, projecting very little, closely set, almost equal, and delicately granulated ; those of the first cyclum not differing much from the others, but bearing, at a short distance from the calicular edge, a strong spiniform appendix, which is rather compressed, extends outwards, and presents, on its under edge, a small pointed tubercle. Calice circular. Septa forming four complete cycla and six equally developed systems ; closely set, rather exsert, thin, and unequally developed ; but those of the second cyclum differing very little from the primary ones. Pali narrow and rather thick. Height of the corallum, one line and a half; diameter of the calice, two lines and a half. Fossil from the Nummulitic , formation at Fabresan and Bos dWrros.
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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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INTRODUCTION. xlvii 4. Genus Micbab
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INTRODUCTION. xlix 14. Genus Ctclos
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INTRODUCTION. li the sclerenchyma,
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INTRODUCTION. liii 7. Genus Stephan
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INTRODUCTION. Iv Family VII. PORITI
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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
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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 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 120 and 121: CX)RALS FROM THE GAULT. G7 and have
Page 122 and 123: ' Petref. : ; CORALS FROM THE GAULT
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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.
Page 152 and 153: 312 GENERAL INDEX. Dendrophyllia de
Page 154 and 155: 314 GENERAL INDEX. . Halysites cate
Page 162: 322 GENERAL INDEX. Xenia Zaphrentis
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