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| Keywords: The Quarterly journal of the Geological Society of London (13860036714).jpg LITTLE-KNOWN JUEASSIC CELSTOLDS <br> 3£ <br> radials have a corresponding curve so that these joints are con- <br> siderably longer in the middle than at the sides by the greater part <br> of which they are united to their fellows The pentagonal axillaries <br> are short and wide barely half as long again as the second radials <br> Fig 1 ” Antedon latiradia n sp <br> A From beneath B From the side Twice the natural size <br> From the Great Oolite of Bradford <br> their proportions being length width 11 20 The first brachials <br> are united for about half the length of their inner sides which are <br> shorter than the outer ones owing to the inclination of the proximal <br> and distal edges to one another This is more markedly the <br> case with the second brachials The third brachial is a syzygial <br> or double joint and the two following joints are transversely oblong <br> On one of the three remaining arm-bases the fifth brachial is also a <br> syzygial joint <br> The articular face of one first radial is visible It is roughly <br> trapezoidal in shape 4 mm high and a trifle wider across the <br> transverse ridge which rises up around the opening of the axial <br> canal into a triangular articular surface Beneath this is a small fossa <br> with a deep central pit for the insertion of the dorsal elastic liga- <br> ment The greater part of the articular face is taken up by the <br> large plates for the attachment of muscles and ligaments but the <br> boundaries of their respective fossae are not very distinct There is <br> a shallow but wide notch between the two muscle-plates though it <br> is not clear whether there was any vertical ridge descending from <br> it towards the opening of the axial canal If there was one it <br> became less marked as it approached the transverse ridge ; for on <br> each side of the apex of the triangular articular surface is a deepish <br> pit which marks the central end of the ligament-fossa These two <br> pits are connected by a shallow depression above the apex of the <br> tsiangle so that the whole has somewhat of an hourglass-shape <br> Size Diameter of centrodorsal 7 5 mm ; diameter across the <br> circle of radial axillaries 14 mm <br> Locality and horizon The Great Oolite Bradford 36935764 113692 51125 Page 39 Text 38 http //www biodiversitylibrary org/page/36935764 1882 Geological Society of London NameFound Antedon latiradia Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 38 1882 Geology Periodicals Smithsonian Libraries bhl page 36935764 dc identifier http //biodiversitylibrary org/page/36935764 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-15 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13860036714 2015-08-26 07 53 39 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1882 Photos uploaded from Flickr by Fæ using a script | ||||
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