Remarks on Conosaurus of Gibbes

Joseph Leidy
1868 Proceedings of the Academy of Natural Sciences of Philadelphia  
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more » ... ntent at JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact 200 PROCEEDINGS OF TIHE ACADEMY OF been found in the triassic red sandstone of Prince Edward's Island, have the same form as those of Megalosaurus, Dinodon and Ltlap8. But here, so far as we have the corresponding parts for comparison, the resemblance ceases. The remarkable depth of the dentary bone in relation with its length in Bathygnathus, indicates a form of head very different from that of Megalosaurus and its American representatives. It was this unusual relation of depth to breadth which led me to suspect a form of head more in accordance with that of the skeleton of an upright animal, and led me to ask the question, "' was this animal probably not one of the bipeds which imade the so-called bird tracks of the New Red Sandstone of the valley of the Connecticut?" (See Jour. Ac. Nat. Sc. 1854, 329 ) Subsequently, in examining the remains of Iladrosaurus, the American representative of iguanodon, from the great disproportion between the fore and hind parts of the body, I was led "to suspect that this great herbivorous lizard sustained itself in a semi-erect position on the huge hinder extremities anid tail, while it browsed on plants growing upon the shores of the ocean." (Cret. lIept. of the U. S. 1865, 97.) The remains referred to Lwlaps exhibit even a far greater disproportion between the fore and hind limbs than in Hadrosaurus, which, together with its long bird-like claws, etc., suggested to Prof. Cope a similar position of body to that of Hadrosaurus, and a use of the hind limbs in attack upon the prey of the animal analagous with that in the eagle (Pr. A. N. S. 1866, 279). The extraordinary disproportion bet-ween the fore and hind limbs of Lwelaps, which appears to me so closely related with Megalosaurus, leads me to suspect that the remains described by Buckland, Cuvier, Owen and others, and attributed to the shoulder of M. Bucklandi, perhaps, at least in part, belong to the pelvis, if they in whole or part do not belong to other animals. Had the humerus of LTlaps been found isolated, I never would have thought of associating it in the same skeleton with the huge bones of the hinder extremity of that animal. Perhaps, when this great disproportion comes to be known, it may be discovered that there exist specimens of remains of the fore limbs of Alegalosaurus, from the Wealden, in the British or other museums of England, which heretofore have excited no suspicion as to their true relations. Teratosaurus, from the upper Keuper, in the vicinity of Stuttgart, described by Meyer (Palaeontographica, 1859-61, 258) , approached Bathygnathus most in the proportions of its face, as well as resembled it in the form of the teeth, but the fossil dentary bone of the latter is even still shorter and deeper than would relate to the fossil maxillary of the former. Remarks on CONOSAURUS of Gibbes.