File:The Quarterly journal of the Geological Society of London (1918) (14596514488).jpg

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Identifier: quarterlyjourna741918geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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Text Appearing Before Image:
.1 Whorl depressed, venter nearly flat, umbilicus fairly small, thetubercles unpaired, about 22/18. The inner whorls of L. obtusinodum have no Capricorn stage,but the tubercles are tine and paired until the diameter of 2o mm. L. obtusinodum occurs in Dorset in the Belemnite Stone andthe beds immediately below it.2 One such form (W. D. L. Coll.1493) has the following dimensions :— Diameter. Whorl height. Whorl thickness. Umbilicus. 25 mm. 44 per cent. 68 per cent. 2S per cent, 19 42 63 26 The suture is a little more complicated than that of Z. hetero-genes (fig. 4 c). 1 H. G. Bronn, Lethaea Geognostica vol. i (1835-37) p. 449 <x pi. xxiii,%. 7. 2 W. D. Lang, The Ibex Zone at Charmouth, &c. Proc. Geol. Assoc.•vol. xxviii (1917) p. 33. Fig. 4.—Sutures of Liparoceras spp. f 70 mm. L. pseud o striatum(Lyme Regis). e30 mm. L. heterogenes(Napton). d40 mm. L. tiava(near Cheltenham) c 45 mm. L. obtusinodnm(Napton). 20 mm. L. cheltiense (Cheltenham). 8 mm.L. cheltiense(Cheltenham).
Text Appearing After Image:
part 4) THE EVOLUTION OF THE LIPAKOCEEATID.E. 271 Lipabocehas cheltiense (Murchison). (PI. XXI, figs. 4 rt-4 d ;text-figs. 4 a & 4 6, p. 270.) Kefigured, Palaeontologia Universalis pt. iii, ser. 1 (1905) No. 67.Dimensions of figure :— Diameter. Whorl height. Whorl thickness. Umbilicus. 93 mm. 45 per cent. 67 per cent. 24 per cent. In the type-specimen the early part of the last whorl is similarin shape and ornament to L. obtusinodum. Towards the end ofthe whorl, however, the whorl height increases and the peripherybecomes more strongly arched, while the unpaired rounded tuberclesgive place to paired bullae or transversely extended tubercles : thisreturn to paired tubercles is the first indication of catagenesis. The details of the suture in the tjpe-specimen are not discernible;but it is clear that the external saddle is narrower than the firstlateral lobe, the latter bein°* mainlv ventral to the outer tubercles.(British Museum—Natural History, Xo. 74955 a.) Development of Li

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Volume
InfoField
1918
Flickr tags
InfoField
  • bookid:quarterlyjourna741918geol
  • bookyear:1845
  • bookdecade:1840
  • bookcentury:1800
  • bookauthor:Geological_Society_of_London
  • booksubject:Geology
  • bookpublisher:London__etc__
  • bookcontributor:Smithsonian_Institution_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:447
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
30 July 2014

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