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| Keywords: The Quarterly journal of the Geological Society of London (13937063012).jpg CHELONIA AND A TOOTH OF ORNITHOPSIS 237 <br> the shell of a Chelonian from the Wealden preserved in the Natural <br> History Museum which indicates a species of the genus Plesiochelys <br> so nearly allied to P sanctce-verence Eiitimeyer of the Kimeridgian <br> of Switzerland that we were provisionally inclined to refer it to the <br> same species <br> I have lately received the loan of another Chelonian shell belong- <br> ing to the Rev P B Brodie from the Wealden of Atherfield in <br> the Isle of Wight which indicates the occurrence of a second <br> English species of Plesiochelys also allied to a species from the Swiss <br> Kimeridgian <br> Of this specimen a restored view of the carapace and plastron are <br> given in figs 4 5 Unluckily the neural and costal bones of the <br> carapace have all been dislocated and in some cases overlap one <br> another to a certain extent ; while several of the neurals and nearly <br> all the marginals are missing Fortunately however the sulci <br> formed by the boundaries of the vertebral and costal epidermal shields <br> are very clearly marked and are sufficient to show the entire con- <br> tour of the vertebral shields The plastron is nearly entire and <br> shows the absence of a mesoplastral by which the specimen is at <br> once distinguished from Pleurostemum ; the epi- and entoplastrals <br> have been dislocated and thrust in between parts of the broken <br> nuchal of the carapace <br> The general contour of the specimen and especially the sinuous <br> outline of the borders of the vertebral shields and the distinct oblique <br> longitudinal striation of the neural and adjacent portions of the <br> costal bones together with the four long and narrow infra-marginal <br> shields on the plastral surface indicate without doubt that the <br> specimen belongs to the genus Plesiochelys <br> In the complete ossification of the plastron it agrees with the <br> Kimeridgian species P soloclurensis Eiitimeyer and probably with <br> P sanctce-verence Eiitimeyer f and differs from P Etalloni of the <br> same writer in which there is a persistent plastral vacuity It <br> further differs from P sanctce-verence and the above-mentioned <br> Wealden shell by the much less strongly marked striations on the <br> neurals and costals which are mainly confined to the median <br> region of the carapace ; the vertebral shields are also relatively <br> narrower The plastron of P sanctce-verence is unknown ; but that <br> of the allied Wealden form is relatively shorter and wider and con- <br> nected by a longer bridge with the plastron <br> Compared with Eiitimeyer's figures of the upper and under sur- <br> face of the male shell of P solodvrensis already cited the resem- <br> blance presented by the present specimen is so exceedingly close as <br> to leave no doubt of the near relationship of the two forms In the <br> English specimen the pectoral shield of the plastron is nearly as long <br> as the abdominal instead of being very much shorter ; while the <br> posterior border of the abdominal is much less oblique The infra- <br> marginals are moreover relatively wider in the English form On <br> the carapace the chief difference that can be detected between the <br> Foss Schildkroten von Solothurn pi xii <br> t Ibid pi xiii 36940028 113696 51125 Page 235 Text 45 http //www biodiversitylibrary org/page/36940028 1889 Geological Society of London NameFound Chelonia NameConfirmed Chelonia EOLID 19671 NameBankID 4935336 NameFound Ornithopsis NameConfirmed Ornithopsis NameBankID 4270321 NameFound Plesiochelys NameConfirmed Plesiochelys EOLID 13124282 NameBankID 4302085 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36940028 dc identifier http //biodiversitylibrary org/page/36940028 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 N02/13937063012 2015-08-26 06 53 11 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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