. Un catalogue descriptif des reptiles marins de l'Oxford de l'argile. Basée sur la collection de Leeds au British Museum (Natural History), Londres ... Les reptiles, les combustibles. OPHTHALMOSAIJEUS. •51 La description de l'humérus est rendue difficile par la circonstance, que tous les spécimens de la collection sont libres et non pas dans leur position naturelle par rapport au reste du squelette, comme c'est habituellement dans les spécimens de l'Ichtyosaure LIAS. Par conséquent il n'a pas été facile de déterminer avec certitude qui est le droit et que le gauche, et donc aussi ce qui est la partie dorsale et

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. 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. OPHTHALMOSAIJEUS. •51 The description of the humerus is rendered difficult by the circumstance, that all the specimens in the collection are free and not in their natural position in relation to the rest of the skeleton, as they usually are in the specimens of the Liassic Ichthyosaurs. Consequently it has not been easy to determine with certainty which is the right and which the left, and therefore also which is the dorsal and which the ventral (palmar) face. A further difficulty is also introduced by the fact that when these animals died the paddles seem sometimes to have fallen over on to their dorsal surface, even when the remainder of the skeleton clearly rested on its ventral face. The position of the paddles in several specimens has been carefully noted by Mr. A. N. Leeds, and the following determination of the right and left, and of the upper and lower face, Text-fitj. 35.. Upper surface of restored shoulder-girdle of Oj)hthalmosaurus. (R. 2137, about nat. size.) d., clavicle ; cor., coracoid ; i.d., interclavicle ; sc, scapula. depends mainly on his observations. It should be noted that the account of this bone and of the femur given in the ' Geological Magazine' (dec. 5, vol. iv., May 1907, p. 202 *) is erroneous so far as these points are concerned. In the following description tlie limb is supposed to be in such a position that the expanded paddle has its palmar (ventral) surface looking downwards and backwards, and making an angle of about 45° with the vertical. The direction of the paddle with reference to the proximal end of the humerus is marked in text-iig. SG by the line a-b, a being uppermost. In this case the border * See also Geol. Mag. [5] vol. v. p. 9G.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabilit

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