. Bulletin of the British Museum (Natural History), Geology. 158 A REVIEW OF UPPER JURASSIC PLIOSAURS plete of any from the Kimeridge Clay. This species, which was formerly one of the most obscure, is now the best known of Kimeridgian pliosaurs. Description of proposed neotype. The neotype centrum is very distinctive as it possesses a double rib facet on its left side and a single facet on the right. The articular surfaces of the vertebra are transversely ovate in outline and are slightly concave. Each has a small depression at its centre, without any suggestion of con- vexity here as in the p
. Bulletin of the British Museum (Natural History), Geology. 158 A REVIEW OF UPPER JURASSIC PLIOSAURS plete of any from the Kimeridge Clay. This species, which was formerly one of the most obscure, is now the best known of Kimeridgian pliosaurs. Description of proposed neotype. The neotype centrum is very distinctive as it possesses a double rib facet on its left side and a single facet on the right. The articular surfaces of the vertebra are transversely ovate in outline and are slightly concave. Each has a small depression at its centre, without any suggestion of con- vexity here as in the posterior cervical vertebrae of other Kimeridgian pliosaur species. The margins of the articular surfaces are very sharply defined, and there is no evi- dence of either a marginal bevel or groove. On the anterior and posterior margins. Fig. G. Pliosaurus brachyspondylus (Owen). , Sedgwick Mus. Reconstruction of left half of pectoral girdle, x |. After Tarlo (1959) of the ventral surface of the centrum are two strips of finely sculptured rugose bone between which the surface is remarkably smooth. This last feature is very striking and can readily be used to distinguish the species. Description of associated skeleton from Ely. Teeth. The teeth are similar to those of Pliosaurus brachydeirus Owen, being trihedral in cross-section; the enamel of the flat outer surface is smooth but the remainder of the crown is charac- terized by longitudinal Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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