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Among the Dinosaurian remains from the Upper Jurassic of the United States, recently described by Prof. Marsh, none are perhaps more interesting than the vertebræ and teeth upon which the genus Pleurocœlus* has been based, since they indicate a comparatively small form closely allied to the gigantic Morosaurus, and less nearly so to the still more huge Brontosaurus. In the type species of Pleurocœlus the teeth are said to be of the same general type as those of Morosaurus, but are not distinctly spoon-shaped, and are thus more like a compressed cone. The centra of the dorsal vertebræ, which are less than four inches in length, are elongated and very markedly opisthocœlous, with a long and deep lateral cavity, of which the upper portion gradually shelves towards the arch.
Recognizing the Sauropodous nature of the teeth from the Wealden of Sussex and the Isle of Wight, provisionally referred by Mantell and subsequently by Sir R. Owen to Hylœosaurus (one of which is shown in the woodcut), I proposed 
some time ago to regard them provisionally as indicating a European representative of the American genus, with the name of Pleurocœlus valdensis. These teeth indicate a very small member of the Sauropoda, and, although their crowns are subject to considerable variation in form, many of them show the absence of a decided spoon-shape, characteristic of those of the type species.
In the same notice I referred to the imperfect centrum of a dorsal vertebra from the Wealden of Cuckfield, preserved in the
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