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| Keywords: The Quarterly journal of the Geological Society of London (13960493863).jpg 514 ME R LYDEKKER ON CERTAIN CHELONIAN REMAINS <br> to satisfy myself absolutely that this form is generically distinct <br> from either Hydropelta of the Lithographic Limestone or Ohitra- <br> cephalus of the Wealden the type specimens of those two genera <br> being of a character which does not admit of exact comparison I <br> shall however elsewhere adduce certain evidence tending to show <br> that Hylceochelys is not identical with Ghitracephalus A second <br> species of Hylceochelys will be represented by Ohelone Belli which <br> appears to be specifically distinct from the type species and in <br> any case the specific name Belli as the earlier has a right to stand <br> The Chelonian from the Kimeridgian of Hanover described by <br> Maack as Chelonides Wittei would appear to indicate a form more <br> or less closely allied to Hylceochelys ; but the generic name is pre- <br> occupied f The insufficiently described Plastremys Owen is pro- <br> bably also identical with this genus <br> Reverting to the forms described as Pleurosternum it is evident <br> that the type of P emaryinatum Owen also belongs to Hylceochelys <br> although the other examples referred to that species by its founder <br> are veritable Pleurosternidae Again the specimen from the Wealden <br> of Germany described as P Koeneni is likewise referable to the <br> new genus and probably belongs to the type species <br> The removal of these three species from Pleurosternum will reduce <br> the four species assigned to that genus by its founder Sir R Owen§ <br> to two viz P continuum and P ovatum The former species is the <br> first of the four which are referred to the genus in the original <br> memoir and as pointed out by Prof Cope must undoubtedly be <br> regarded as the type of the genus In the joint communication by <br> Mr Boulenger and myself published in the ' Geological Magazine/ <br> to which reference has been already made it was shown that the <br> plastron described by Sir 11 Owen at an earlier date under the <br> name of Platemys Bullocki and erroneously supposed to have been <br> obtained from the London Clay was in reality from the Purbeck <br> and appeared to be specifically identical with the type of Pleuro- <br> sternum ovatum and with some of the specimens described as <br> P emaryinatum We accordingly proposed to supersede the name <br> Pleurosternum ovatum by Pleurosternum Bullocki making no mention <br> of P concinnum It had however escaped our notice that Prof <br> Cope had seen occasion to regard the so-called Platemys Bul- <br> locki as generically distinct from Pleurosternum tj pified by P con- <br> cinnum and had proposed for it the name Digerrhum <br> It appears indeed so far as I can gather that Prof Cope was <br> induced to separate Platemys Bullocki from Pleurosternum on the <br> ground that the latter had no intergular shield A portion of such <br> shield is however clearly seen in P concinnum ” the type of the <br> latter genus ” and the distinction consequently falls to the ground <br> ' Palaeontographica ' vol xviii part 2 p 133 1869 <br> t In 1834 for a genus of Lepidoptera <br> \ Grabbe ' Zeitschr deutsch geol Gres ' vol xxxvi p 19 1881 <br> § « Wealden and Purbeck Eeptilia ' Mon Pal Soc pt i p 2 1853 <br> Geol Mag decade 3 vol iv p 573 1887 <br> Trans Amer Phil Soc vol xiv pt i p 156 1870 36940343 113696 51125 Page 512 Text 45 http //www biodiversitylibrary org/page/36940343 1889 Geological Society of London NameFound Chelonides NameConfirmed Chelonides NameBankID 4112216 NameFound Digerrhum NameConfirmed Digerrhum NameBankID 4143376 NameFound Hydropelta NameConfirmed Hydropelta NameBankID 4200423 NameFound Lepidoptera NameConfirmed Lepidoptera EOLID 10920368 NameBankID 425288 NameFound Plastremys NameConfirmed Plastremys NameBankID 4299853 NameFound Plastremys continuum NameFound Plastremys ovatum NameFound Platemys NameConfirmed Platemys EOLID 35532 NameBankID 2543795 NameFound Platemys concinnum NameFound Pleurosternidae NameConfirmed Pleurosternidae EOLID 4522727 NameBankID 5703545 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36940343 dc identifier http //biodiversitylibrary org/page/36940343 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 N02/13960493863 2015-08-26 05 51 32 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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