Archive image from page 110 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 .. descriptivecatal02brit Year: 1910 STENEOSAUEUS. 81 looking almost directly upwards; a small preorbital opening usually present. Frontal small and the skull-roof much flattened, passing quite gradually into the upper surface of the snout. The alveolar border straight, without undulations. Internal narial opening rounded, palatal vacuities of moderate size. Teeth numerous, with the ename
Archive image from page 110 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 .. descriptivecatal02brit Year: 1910 STENEOSAUEUS. 81 looking almost directly upwards; a small preorbital opening usually present. Frontal small and the skull-roof much flattened, passing quite gradually into the upper surface of the snout. The alveolar border straight, without undulations. Internal narial opening rounded, palatal vacuities of moderate size. Teeth numerous, with the enamel marked by longitudinal ridges, of which, as a rule, one on the anterior and one on the posterior side of the crown, at least near the point, form well-marked carina?. Vertebra? slightly concave, the posterior caudals all with backwardly directed spines, there being no sharp deflection of the end of the tail, such as occurs in the Metrio- rhynchida?. Fore limb not reduced to a paddle-like structure as in the above- mentioned family. The tibia about half the length of the femur, and the sum of the length of the femur and tibia considerably more than twice the sum of the lengths of the humerus and radius. Armour consisting of a double row of keeled plates running down the mid-dorsal line, the successive plates uniting by an overlapping and peg-and- Text-fig. 31. imx. Semi-diagrammatic figure of the upper surface of the skull of Steneosaurus durdbrivensis. (About nat. size.) hoc, basioccipital; /., frontal; /., jugal; /., lachrymal; , maxilla ; n., nasal; nar., external nares ; par., parietal; pmx., premaxilla ; , postfrontal; , prefrontal ; jit., pterygoid ; q., quadrate ; , quadrato-jugal; sq., squamosal. socket articulation; also numerous other plates, probably ventral, the arrangement of which is uncertain. Middle and Upper Jurassic. Mystriosaurus of Kaup (in Bronn's Lethsea Geogn. ed. 1, vol. i. 1837, p. 525) is by many writers regarded as a synonym of
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