. 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. 56 MAEINE EEPTILES OF THE OXEOED CLAY. is fused with the opisthotic, the line of division (text-fig. 12, D, s.) being quite distinct on the surfaces for union with the supraoccipital and basioccipital. The united bones (exo-opisth.) consist of a stout columnar portion forming the sides of the foramen magnum and enclosing part of the auditory organ, and a long paroccipital process () projecting outwards and downwards and e
. 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. 56 MAEINE EEPTILES OF THE OXEOED CLAY. is fused with the opisthotic, the line of division (text-fig. 12, D, s.) being quite distinct on the surfaces for union with the supraoccipital and basioccipital. The united bones (exo-opisth.) consist of a stout columnar portion forming the sides of the foramen magnum and enclosing part of the auditory organ, and a long paroccipital process () projecting outwards and downwards and expanding somewhat at the end. The posterior border of the stout columnar portion is broadly rounded below and bears a backwardly directed facet above (text-fig. 11, fac), looking like a zygapophysis ; this may have articulated with a pro-atlas, or perhaps merely served for the attachment of ligament. The lower end of the combined bones widens out and bears a broad Text-fig. 11. Jiarji Occipital region of skull of Peloneustes philarchus, from behind. (E. 3803, § nat. sine.) , exoccipital-opisthotic ; fac, facet like a zygapophysis ; , foramen magnum ; , lateral (pterygoid) process of basioccipital; , occipital condyle ; , paroccipital process ; , facet for union with the parietals; , supraoccipital. surface, convex in the middle, for union with the basioccipital; the greater part of this surface is formed by the ventral end of the exoccipital (text-fig. 12, D, ), but the anterior angle, which is separated from the rest by a deep groove, is on the lower end of the opisthotic ('). At their upper ends also the united bones widen out, here bearing two facets—a posterior, triangular one, looking inwards and upwards, for union with the supraoccipital (text-fig. 12, D), and a smaller anterior surface directed forwards, upwards, and inwards for the lower end of the prootic (). Only a small portion of the posterior surface
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreptile, bookyear1910
