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| Keywords: The Quarterly journal of the Geological Society of London (13937330301).jpg <br> PROM THE WEALBEN AND TURBECK 513 <br> one may be named interpectoral On this view the gnlars will <br> have been placed anteriorly to the intergular in the same manner <br> as in Chelodina <br> Our specimens indicate therefore a Chelonian of medium size <br> characterized by the occurrence of a row of median and probably <br> azygos plastral shields dividing the normal plastral shields below <br> the gulars This series is a continuation of the intergular now <br> found in all Pleurodira and some Cryptodira and may in all proba- <br> bility be regarded as indicating an archaic type of structure the <br> Chelonian plastron having probably been developed from abdominal <br> ribs like those of SpJienodon and apparently showing a tendency to <br> the obliteration of some of its elements with advancing specializa- <br> tion No existing Chelonian exhibits this multiplication of plastral <br> shields ; but Mr Boulenger has figured a minute interanai shield <br> in two specimens of Macroclemmys one of which also exhibits an <br> equally minute azygos shield in the centre of the plastron <br> A feature of a somewhat analogous nature to that characterizing <br> the plastron under consideration is however found in the carapace <br> of a Chelonian from the Kimeridgian of Hanover figured by Dr <br> Portis in the ' Palseontographica ' vol xxv pi xv under the name <br> of Trojpidemys Seebachi In that specimen the normal azygous series <br> of vertebral shields is divided into two lateral series by a more <br> numerous row of small intervertebral shields nearly corresponding <br> in number with the underlying neural bones In the characters of <br> the bony elements of the carapace that specimen corresponds closely <br> with typical species of Tropideinys ˘ but the multiplication of the <br> shields should not improbably be regarded as a generic character <br> It occurs to me that the carapace of the Wealden form may perhaps <br> have had a similar series of intervertebral shields <br> b The Affinities of Pleurosternum <br> The Purbeck Chelonian to which Sir R Owen applied the name <br> Pleurosternum latiscutatum as has been shown by Mr Poulenger and <br> myself has no connexion with the Pleurosternidse but belongs to <br> the Plesiochelyidse ; and from the evidence afforded by a nearly entire <br> shell of the last-named species from the Wealden it appears that <br> the plastra described by Sir E Owen as Platemys Mantelli and <br> P Dixoni are really referable to the so-called Chelone Belli which <br> is thus shown to be an allied form <br> It may also be observed in this connexion that the so-called <br> Pleurosternum latiscutatum was provisionally referred by my friend <br> and myself in the paper above cited to the genus Plesioclielys Subse- <br> quent observations have however shown that the vertebral shields <br> are much wider than in that genus ; and since there are other <br> distinctive features which I shall indicate elsewhere I feel jus- <br> tified in proposing the new generic name Hylaioclielys for this <br> Chelonian I may state however that I have found it impossible <br> G-eol Mag decade 3 vol iv p 272 1887 In this communication <br> Pleurosternum was referred to the Pelomedusidae <br> Q J G S No 179 2o 36940342 113696 51125 Page 511 Text 45 http //www biodiversitylibrary org/page/36940342 1889 Geological Society of London 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 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36940342 dc identifier http //biodiversitylibrary org/page/36940342 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13937330301 2015-08-26 05 51 29 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by Fæ using a script | ||||
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