. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. 12 MAEINE EEPTILES OF THE OXEOED CLAY. The basisphenoid (text-figs. 1, 5, 6, 7) is a stout and very massive bone. Its posterior and most of its upper surfaces are greatly roughened and were obviously thickly covered by cartilage in life. In this region the bone is divided into two prominent comex bosses, separated by a deep median groove running from the middle of the upper anterior edge to the lower posterior border. The poste
. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London ... Reptiles, Fossil. 12 MAEINE EEPTILES OF THE OXEOED CLAY. The basisphenoid (text-figs. 1, 5, 6, 7) is a stout and very massive bone. Its posterior and most of its upper surfaces are greatly roughened and were obviously thickly covered by cartilage in life. In this region the bone is divided into two prominent comex bosses, separated by a deep median groove running from the middle of the upper anterior edge to the lower posterior border. The posterior faces of these prominences are slightly flattened, or even slightly concave, and were directed towards Text-fig. Eeconstructioii of the posterior region of skull of Ophihalmosauvus from behind. (About | nat. size.) art., articular surface of quadrate; hoc, basioceipilal; cond., occipital condyle; exo., exoeeipital; for., foramen in supraoccipital; , foramen magnum ; ojj., opisthotic ; , facet for opisthotic; p., process of supraoccipital projecting into foramen magnum; ], facet for parietal; , parietal branch of the squamosal; , postero-external angle of the squamosal; pt., pterygoid ; , post- temporal fossa ; q., quadrate ; g.'Asg., quadrate branch of the squamosal; soc, supraoccipital; St., stapes; , temporal branch of squamosal; XU', foramen for posterior branch of the hypoglossal nerve. the corresponding anterior sui-faces of the basioccipital, though probably separated from them by a thick pad of cartilage. The presence of the deep median groove above noticed may be a trace of the original ossification of this bone from two lateral centres. The anterior border of the upper surface is raised into a parr of blunt processes separated by a slight notch: these are the posterior clinoid processes (). Beneath them the anterior face of the bone is at first vertical and then slopes slightly backwards, forming the posterio
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
