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| Keywords: The Quarterly journal of the Geological Society of London (13205080823).jpg ANNIVERSARY ADDRESS OF THE PRESIDENT 47 <br> K Parker has shown the true clavicles are to be found in the <br> episternal elements of the plastron dermal ossifications ; the reputed <br> Fig 3 ” Shoulder-girdle of Chelone mydas dorsal view Slightly <br> altered after Parker <br> cl the clavicle; ic the inter clavicle ; per the prascoracoid ; c the coracoid <br> clavicles which are parts of the cartilaginous endoskeleton are then <br> the praccoracoids ; whence it follows that there is a degree of <br> probability almost amounting to proof that the corresponding bar in <br> Plesiosaunis is also praecoracoid and thus evidence of the presence of <br> true clavicles in this genus and I may add Nothosaurus fails ; so <br> that in the present state of our knowledge on this point we are <br> warranted in considering clavicles to be wanting in Sauropterygia <br> There remains for comparison one more piece the azygos median <br> bone called episternum or interclavicle <br> In Ichthyosaurus fig 1 this T-shaped bone so closely agrees in its <br> form and its relations with the interclavicle of existing Lizards and <br> Chelonia that its homology with this is unimpeachable Can the same <br> be maintained of the analogous piece in the shoulder-girdle of Plesio- <br> saurus I submit that its homology with the lacertilian interclavicle <br> is more than doubtful The Lizard's interclavicle is a membrane <br> bone ; it lies superficially fig 4 In Ichthyosaurus as in extant <br> Lizards it lies at the under surface of the other endoskeletal elements <br> of the girdle In Plesiosaunis fig 2 the reputed clavicle lies above <br> the praecoracoids and coracoids upon their upper or visceral surface 36929352 113681 51125 Page 47 Text 39 http //www biodiversitylibrary org/page/36929352 1883 Geological Society of London NameFound Chelone mydas NameConfirmed Chelone mydas BOULENGER 1889 EOLID 454546 NameBankID 11055775 NameFound Chelonia NameConfirmed Chelonia EOLID 19671 NameBankID 4935336 NameFound Ichthyosaurus NameConfirmed Ichthyosaurus EOLID 13226022 NameBankID 4204055 NameFound Nothosaurus NameConfirmed Nothosaurus EOLID 4532508 NameBankID 4260130 NameFound Plesiosaunis NameFound Sauropterygia NameConfirmed Sauropterygia EOLID 4532436 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 39 1883 Geology Periodicals Smithsonian Libraries bhl page 36929352 dc identifier http //biodiversitylibrary org/page/36929352 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-16 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13205080823 2015-08-26 12 54 38 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1883 Photos uploaded from Flickr by Fæ using a script | ||||
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