A monograph of the British fossil corals - kreidefossilien.de

More documents

Recommendations

Info

CORALS FROM THE LOWER CHALK. 53 CHAPTER IV. CORALS FROxM THE LOWER CHALK. The number of British Corals known to belong to this formation is as yet so very small, that it would be premature to speculate on their mode of distribution. We have seen but two species, one appertaining to the family of Ocidinidse, the other to that of Eupsammidaj ; both appear to be peculiar to the lower chalk of England. Family OCULINID^ (p. xix). Genus Synhelia (p. xx). Stnhelia Shabpeana. Tab. IX, fig. 3, 3 a. Corallum composite, dendroid, with thick, erect branches, forming acute angles with each other, and presenting on their surface large, non-exsert, cii'cular caUces, which are not closely set, and are united by rather indistinct, small costal striae. Calices quite superficial, and presenting scarcely any central depression. Columella assuming the appearance of a small, obtuse tubercle. Three complete cycla of septa, and in one half of each system two quaternary septa, of which no homologues exist in the other half. The septa are thick, very closely set, almost straight, and unequally developed, but those of the second order differ but little from the primary ones. The upper edge of all is horizontal, and closely denticulated; towards the columella the denticidatious are rather larger than towards the calicular margin, and we have not been able to decide whether some of them do not constitute pah. The lateral surfaces of the septa present oblong transverse granulations, which much resemble incomplete synapticulge, but they are not prominent enough to meet those of the adjoining septa, and to subdivide the interseptal locuh. The height of the specimen here described is about two inches and a half, and the diameter of the calices two lines. We are as yet acquainted with but two other species that can be referred to our genus Synhelia ; one is the 8. gibbosa, which was first described by Goldfuss under the name of
54 BRITISH FOSSIL CORALS. Lithodendron gihhosum^ and which belongs also to the lower Chalk formation, but is found at Bochum, in Westphalia, and at Blaton, near Mons, in Belgium. It differs from 8. Sharpecma, by its calices being more closely set ; rather oblong, with a more prominent margin, and twenty-four nearly equal, very thick septa, separated by an equal number of rudimentary ones. The other is the Madrepora Meyeri, found by MM. Koch and Dunker in the Jurassic formation at Elligser-Brinke ; it has deep calices.^ The unique specimen here described appears to have been found in the lower chalk near Dover, and was kindly communicated to us by Mr. Daniel Sharpe. Family EUPSAMMIDJ3 (p. li). Genus Stephanophyli-ia (p. liii). Stephanophtllia Bowerbankii. Tab. IX, fig. 4, 4 a, 4 h, 4 c. Stephanophyllia Bowerbankii, Milne Edwards and J. Haime, Monogr. des Eupsaramides, in Annales des Sciences Naturelles, 3"" serie, Zool. vol. X, p. 94, 1848. Corallum simple, resembling, in its general form, a plano-convex lens. Wall discoidal and horizontal. Costa nixmerous, delicate, nearly equal, closely set by pairs, and formed by a simple series of granulations, which become the most distinct near the outer edge of the mural disc. Twenty-four of these costfe begin near the centre of the corallum, and soon after bifurcate ; the forty-eight costse thus produced soon divide again, in the same manner, and near the edge of the disc the number of these radiate ridges amounts to ninety-six. The mural pores are small, not very distinct, and arranged in series in the intercostal furrows. Calice quite circular, and appearing to be regularly convex, excepting towards the centre, where there is a slightly-marked, shallow fossula. Columella almost rudimentary, and formed only by two or three trabiculse, which are often scarcely distinct from the edges of the sejda. These last-mentioned organs arise from the upper sm-face of the mural disc, and are thin, especially outwards, closely set, and covered laterally with large, prominent granulations. They form five complete cycla, and repi'esent six well-characterised and equally-developed systems. The primary and secondary septae are straight, and extend to the columella ; their upper edge is arched, or slightly angular. The tertiary septa are also much developed, and bend towards the secondary ones, to which they become united by their inner edge, near the columella. The septa of the fourth and fifth orders, constituting the fourth cyclum, are united in a similar way to the tertiary septa, at about half way from the margin of the mural disc to the columella, but not exactly at the same point, those of 1 Petref. Germ., vol. i, tab. xxxvii, fig. 9. - Beitrage zur Kenntniss des Norddeutsclien oolithgebildes, p. 55, tab. vi fig. 1 1, 1837.
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 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 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 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 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.
Page 150 and 151: 310 GENERAL INDEX.
Page 152 and 153: 312 GENERAL INDEX. Dendrophyllia de
Page 154 and 155: 314 GENERAL INDEX. . Halysites cate
Page 156 and 157:
310 GENERAL INDEX.
Page 158 and 159:
318 GENERAL INDEX.
Page 160 and 161:
320 GENERAL INDEX.
Page 162:
322 GENERAL INDEX. Xenia Zaphrentis
show all

A monograph of the British fossil corals - kreidefossilien.de

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?