File:The Quarterly journal of the Geological Society of London (13937330301).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13937330301).jpg |
THE WEALBEN AND TURBECK. 513 one may be named interpectoral. On this view the gnlars will have been placed anteriorly to the intergular in the same manner as in Chelodina. Our specimens indicate, therefore, a Chelonian of medium size, characterized by the occurrence of a row of median, and probably azygos, plastral shields, dividing the normal plastral shields below the gulars. This series is a continuation of the intergular now found in all Pleurodira and some Cryptodira, and may in all proba- bility be regarded as indicating an archaic type of structure, the Chelonian plastron having probably been developed from abdominal ribs like those of SpJienodon, and apparently showing a tendency to the obliteration of some of its elements with advancing specializa- tion. No existing Chelonian exhibits this multiplication of plastral shields ; but Mr. Boulenger has figured a minute interanai shield in two specimens of Macroclemmys, one of which also exhibits an equally minute azygos shield in the centre of the plastron. A feature of a somewhat analogous nature to that characterizing the plastron under consideration is, however, found in the carapace of a Chelonian from the Kimeridgian of Hanover, figured by Dr. Portis in the ' Palseontographica,' vol. xxv. pi. xv., under the name of Trojpidemys Seebachi. In that specimen the normal azygous series of vertebral shields is divided into two lateral series by a more numerous row of small intervertebral shields, nearly corresponding in number with the underlying neural bones. In the characters of the bony elements of the carapace that specimen corresponds closely with typical species of Tropideinys • but the multiplication of the shields should not improbably be regarded as a generic character. It occurs to me that the carapace of the Wealden form may perhaps have had a similar series of intervertebral shields. b. The Affinities of Pleurosternum. The Purbeck Chelonian to which. Sir R. Owen applied the name Pleurosternum latiscutatum, as has been shown by Mr. Poulenger and myself, has no connexion with the Pleurosternidse *, but belongs to the Plesiochelyidse ; and from the evidence afforded by a nearly entire shell of the last-named species from the Wealden, it appears that the plastra described by Sir E. Owen as Platemys Mantelli and P. Dixoni are really referable to the so-called Chelone Belli, which is thus shown to be an allied form. It may also be observed in this connexion that the so-called Pleurosternum latiscutatum was provisionally referred by my friend and myself in the paper above cited to the genus Plesioclielys. Subse- quent observations have, however, shown that the vertebral shields are much wider than in that genus ; and since there are other distinctive features which I shall indicate elsewhere, I feel jus- tified in proposing the new generic name Hylaioclielys for this Chelonian. I may state, however, that I have found it impossible G-eol. Mag. decade 3, vol. iv. p. 272 (1887). In this communication Pleurosternum was referred to the Pelomedusidae. Q. J. G. S. No. 179.2o |
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Source | https://www.flickr.com/photos/biodivlibrary/13937330301 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36940342 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 511 | ||
Names InfoField | NameFound:Chelodina NameConfirmed:Chelodina EOLID:14338 NameBankID:2546844 NameFound:Chelone NameConfirmed:Chelone EOLID:38375 NameBankID:210457 NameFound:Cryptodira NameConfirmed:Cryptodira EOLID:13075867 NameBankID:1770010 NameFound:Macroclemmys NameConfirmed:Macroclemmys NameBankID:211726 NameFound:Pelomedusidae NameConfirmed:Pelomedusidae EOLID:8130 NameBankID:2549780 NameFound:Platemys NameConfirmed:Platemys EOLID:35532 NameBankID:2543795 NameFound:Pleurodira NameConfirmed:Pleurodira EOLID:13075866 NameBankID:1770011 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36940342 | ||
Page type InfoField | Text | ||
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Flickr posted date InfoField | 21 April 2014 | ||
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current | 05:40, 26 August 2015 | 1,166 × 2,096 (386 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13937330301 | description = <br> PROM THE WEALBEN AND TURBECK. 513 <br> one may... |
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