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| Keywords: The Quarterly journal of the Geological Society of London (13889873748).jpg LYDEKKEK ON THE GENUS MICROCHOCRUS 529 <br> 39 Note on the Zoological Position of the Genus MiCROCHCEEUSy <br> Wood and its Appaeent Identity luith Hyopsodtjs Leidy By <br> K Lydekker Esq B A F G S c Eead June 24 1885 <br> In 1846 the late Mr S V Wood described and figured the palate <br> and left ramus of the mandible of a small mammal from the Upper <br> Eocene of Hordwell under the name of MicrocJioerus erinaceus and <br> considered that it was allied to Hyracotherium ; although the specific <br> name appears to indicate that he had a suspicion of other affinities <br> In 1870 Prof J Leidy t proposed the generic name of Hyopsodus for <br> a small mammal from the reputed Upper Eocene of Wyoming the re- <br> mains of which were figured and described in a later workt and <br> were also regarded as indicating an animal allied to Hyracotherium <br> A recent comparison of the type specimens of Microchosrus which are <br> now in the British Museum No 25229 with Prof Leidy \s figures <br> of Hyopsodus has convinced the writer that the two forms are ex- <br> tremely closely related and in his own opinion generically identical <br> The English form of which the right upper dentition is figured on <br> an enlarged scale in the accompanying woodcut agrees in size with <br> Hyopsodus vicarius Cope§ and the resemblance is so close that it <br> Microchoerus erinaceus The Right Upper Dentition from the <br> palatal aspect x 2 <br> is difficult to point out even specific differences ; the former shows <br> indeed a minute accessory column in the valley external to the <br> true main outer columns in the upper true molars which is wanting <br> in Prof Leidy's figure of H paidus but whether present or absent <br> in H vicarius cannot be determined from Prof Cope's figure In <br> any case the absence or presence of this column would not in the <br> present writer's opinion be a character of more than specific value <br> The figured American specimens of Hyopsodus do not show all <br> the anterior teeth and in this respect the type of Microchoerus is of <br> Charlesworth's London Geological Journal ' No i p 5 pi ii figs 1 and <br> 3 1846 <br> t Proc Ac Nat Sci Philad 1870 p 110 <br> I ' Contributions to Extinct Vertebrate Fauna of the Western Territories ' <br> Rep U S Geol Surv pp 75-80 pi vi 1873 <br> § Vic'e Amer Nat 188o p 460 fig 3 <br> 2p 2 37047409 114009 51125 Page 529 Text 41 http //www biodiversitylibrary org/page/37047409 1885 Geological Society of London NameFound H paidus NameFound Hyopsodus NameConfirmed Hyopsodus EOLID 4524732 NameBankID 4199624 NameFound Hyopsodus vicarius NameFound Hyracotherium NameConfirmed Hyracotherium EOLID 4452113 NameBankID 4203387 NameFound Microchoerus NameConfirmed Microchoerus EOLID 3064462 NameBankID 4242100 NameFound Microchoerus erinaceus NameConfirmed Microchoerus erinaceus Wood 1846 EOLID 4523233 NameFound Microchosrus Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047409 dc identifier http //biodiversitylibrary org/page/37047409 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889873748 2015-08-26 04 58 07 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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