. Un catalogue descriptif des reptiles marins de l'Oxford de l'argile. Basée sur la collection de Leeds au British Museum (Natural History), Londres ... Les reptiles, les combustibles. 14 MAEIN-EEPTILES OXEOED E DE LA CLAT. (Voir texte-Figs. 5, A ; 6, A, B), mais en aucun cas n'elle sépare l'ouverture de la canal carotidien. De chaque côté de la fosse pituitaire le basisphenoid est produit vers l'extérieur dans les deux grands processus ptérygoïde {pt.p.), les surfaces supérieures de ce qui s'iipwards avant ; et, à la base, il y a une perforation stnall {h.c.) menant dans le canal carotidien et sans doute la transmission d'un s

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. 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. 14 MAEIN-E EEPTILES OF THE OXEOED CLAT. (see text-figs. 5, A; 6, A, B), but in no case does it divide the opening of the carotid canal. On either side of the pituitary fossa the basisphenoid is produced outwards into the two prominent pterygoid processes {pt.p.), the upper surfaces of which look iipwards and forwards; at their base there is a stnall perforation {h.c.) leading into the carotid canal and no doubt transmitting a small branch of the internal carotid. The outer ends of the processes are truncated by the facets for the pterygoids looking almost directly outwards and sloping downwards from behind forwards (see fig. 1, C). The ventral surface of the pterygoid processes is roughened for union with the inner plate of the pterygoids, which overlapped and closely united with this part of the ventral face of the basisphenoid, extending back even to the posterior portion of the body, as is shown by the presence of roughened surfaces for union. AVhen the basisphenoid is looked at from below (text-fig. 5, A) its posterior border is seen to be nearly a semicircle, while the anterior border is nearly straight, except for the slight projections formed by the ends of the lower cylindi'ical processes {v.c.p.) Text-fig. 6. p.as. Vic.p.. Basispbenoid of OpJiiJmhnosaunis ani IcJuhr/osaurus: A and B, basisplienoids of Ophthalmosaurus from below; C, basispbenoid of Iclithrjosauriis from below. (A, E. 2164; B, E. 2161; C, E. 2063 : f nat. size.) i.c.f., internal carotid foramina; pas., paraspbenoid; pt.f., facets for pterygoids; iH.p., pterygoid processes ; v.c.p., lower cylindrical processes. and by the anterior angles of the pterygoid processes (pt.p.). As already mentioned, the middle of the ventral face is pierced by the internal carotid foramen {i.c.f.). In front of this the adherent posterior end of the

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• bookcentury1900
• bookdecade1910
• booksubjectreptile
• bookyear1910