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| Keywords: The Quarterly journal of the Geological Society of London (12736390285).jpg 718 <br> H G SEELKY ON THE VERTEBRAL COLUMN <br> The axis is not so well preserved as the atlas being a little <br> weathered on the neural surface and a little crushed on the posterior <br> part of the basal surface ; it is a transverse ellipse 2 inches wide <br> posteriorly and 2 T 7 g- inches deep The articular surface is concave <br> and terminates laterally in a slightly bevelled border <br> The lower part of the side of the centrum has an articulation for a <br> rib e fig 2 The facet is on a level with the base of the centrum <br> and looks outward and somewhat downward Its pedicle is slightly <br> elevated subquadrate and separated from a very small superior <br> facet by a narrow groove ; it does not reach within £ inch of the <br> posterior border of the centrum <br> Other Cervical Vertebra figs 3 4 <br> As the cervical vertebra succeed each other backward they increase <br> slightly in size and length but do not appear otherwise to materially <br> change their characters except in the gradual elevation of the arti- <br> cular facet for the cervical rib <br> The third cervical has the centrum 2-f inches deep and 3 inches <br> wide in front The margin of its articular face is conspicuously <br> bevelled The base of the centrum is marked with a median ridge <br> between which and the pedicles for the ribs are depressed areas each <br> showing in the centre a vascular perforation <br> Fig 3 ” Right Side of Fourth <br> Cervical Vertebra showing <br> the divided articulation for <br> the ril <br> Fig 4 ” Posterior Articular Surface <br> of Centrum of Fourth Cervical <br> Vertebra ; <br> g nat size <br> 1 nat size <br> The pedicles for the ribs are 1 inch deep 1 inch wide' where <br> widest and divided into two subequal parts by a transverse <br> groove ; each of these articular areas is deeply concave The <br> antero-posterior measurement of the centrum on the neural canal is <br> 1 inch ; but it is rather longer at the baee The articular face of <br> the centrum is somewhat concave and has in its centre a puncture- <br> like depression <br> The sixth and seventh are adherent vertebrae with portions of <br> displaced neural arch and cervical ribs preserved They have the 35818895 110705 51125 Page 718 Text 33 http //www biodiversitylibrary org/page/35818895 1877 Geological Society of London NameFound Centrum NameConfirmed Centrum NameBankID 4538849 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 33 1877 Geology Periodicals Smithsonian Libraries bhl page 35818895 dc identifier http //biodiversitylibrary org/page/35818895 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12736390285 2015-08-26 19 59 44 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1877 Photos uploaded from Flickr by Fæ using a script | ||||
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