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| Keywords: The Quarterly journal of the Geological Society of London (12895027415).jpg 1864 DAWKINS EHJSTIC BEDS AND WHITE LIAS 411 <br> and worn lower premolar of Hypsiprymnus Hunteri magnified <br> four times the latter being a little more advanced in wear than <br> the fossil The outer and lower side of its crown presents but <br> the faintest traces of the plica while on the inside they are easily <br> recognized It proves that the absence of plication in the corre- <br> sponding side the lower of the fossil cannot be admitted as evi- <br> dence against its Hypsiprymnoid character In a word the nearest <br> living representative of the fossil appears to me to be Hypsiprymnus <br> Hunteri Bettongia rufescens or some other of the Kangaroo-rats <br> with four-plicated premolars All the premolars of Hypsiprymnus <br> which I have examined are at least twice the size of the fossil <br> Figs 3-5 ” Ulustrating the affinities of Hypsiprymnopsis <br> Rhasticus <br> Fig 3 <br> Fig 5 <br> Fig 4 a <br> Fig 4 b <br> Fig 3 Premolar of Hypsiprymnopsis Bhceticus ; X 4 <br> 4 b Right lower premolar of Hypsiprymnus minor very much worn ; X 4 ; <br> H murinus of Hunt Cat 1784 <br> 4 a Unworn left lower premolar of H minor ; X 4 <br> 5 Unworn left lower premolar of H Hunteri Ow ; X 2 <br> Whether or not the tooth belongs to the Rhaetic Mierolestes cannot <br> be decided because the tubercular true molars of the latter have <br> alone been found Nor can its relation to Plagiaulax be affirmed <br> as the worn crown reveals nothing of the verticality or the obliquity <br> of the folds But nevertheless there is a sufficiently characteristic <br> portion of it left to indicate a premolar most closely allied to that <br> of the Kangaroo-rats Until therefore additional remains be found <br> I have provisionally named it Hypsiprymnopsis Bhceticus ” a name <br> that represents its position in the geological scale and its zoological <br> affinities <br> § V Range of Marsupials in Time <br> It is a very significant fact that all the Secondary Mammalia that <br> have with any accuracy been determined represent one or other of <br> the families of the most lowly organized Mammalian order Of <br> The small jaw of Sterecgnathus from Stoncsfield is sui generis different 36089678 111261 51125 Page 411 Text v 20 http //www biodiversitylibrary org/page/36089678 1864 Geological Society of London NameFound Bettongia rufescens NameConfirmed Bettongia rufescens NameBankID 2483832 NameFound Hypsiprymnopsis NameConfirmed Hypsiprymnopsis NameBankID 4203269 NameFound Hypsiprymnus NameConfirmed Hypsiprymnus NameBankID 112882 NameFound Hypsiprymnus minor NameFound Hypsiprymnus murinus NameFound Mammalia NameConfirmed Mammalia EOLID 15503955 NameBankID 2478620 NameFound Plagiaulax NameConfirmed Plagiaulax EOLID 10553244 NameBankID 4299186 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 20 1864 Geology Periodicals Smithsonian Libraries bhl page 36089678 dc identifier http //biodiversitylibrary org/page/36089678 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-03 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12895027415 2015-08-26 16 55 56 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1864 Photos uploaded from Flickr by Fæ using a script | ||||
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