Archive image from page 36 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal01brit Year: 1910 OPHTnALMOSAUEUS. exoccipital is short and strongly concave from above downwards—in fact, forming merely a deep groove, in the middle of which is the outer opening of the anterior hypoglossal foramen (XII) above noticed, while anteriorly it passes into the border of the jugular notch. The upper end bears two facets, one roughly triangular and slightly co
Archive image from page 36 of A descriptive catalogue of the. A descriptive catalogue of the marine reptiles of the Oxford clay. Based on the Leeds Collection in the British Museum (Natural History), London .. descriptivecatal01brit Year: 1910 OPHTnALMOSAUEUS. exoccipital is short and strongly concave from above downwards—in fact, forming merely a deep groove, in the middle of which is the outer opening of the anterior hypoglossal foramen (XII) above noticed, while anteriorly it passes into the border of the jugular notch. The upper end bears two facets, one roughly triangular and slightly convex for union with the supraoccipital; this surface looks directly upwards. The other surface looks outwards, upwards, and forwards, while above it is continuous with the supraoccipital surface ; this facet, in some cases at least, was in contact with a corresponding surface on the upper posterior angle of the opisthotic {q. v.), but in other specimens the two elements were probably separated by a pad of cartilage. Text-fis. 2. 'or: Esoccipltal aud supraoccipital of OpMlialmosauras : A, right exoccipital from outer side ; B, ditto from inner side ; C, supraoccipital from side; D, ditto from behind. (E. 2162, J nat. size.) , depression for anterior vertical semicircular canal; , facet for basioccipital; , facet for exoccipital; for., foramen of supraoccipital; , jugular foramen ; , facet for the opisthotic ; jp., process of supraoccipital projecting into foramen magnum; , facet for the parietal; , facet for the prootic ; , depression for the posterior vertical semicircular canal; , facet for supraoccipital ; XII, XII', foramina for the exit of the h3rpoglossal nerve. The supraoccipital (text-fig. 2, C & D, also text-fig. 4) is a large fl-shaped bone forming the upper portion of the boundary of the foramen magnum, which is greatly narrowed in this region ; the posterior surface of the bone, as a whole, is gently convex from
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