Notice on some new mosasauroid reptiles from the Greensand of New Jersey

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1869
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Abstract
A STRIKING difference between the reptilian fauna of the Cretaceous of Europe and America is the prevalence in the former of remains of Ichthyosaurus and Plesiosaurus, which here appear to be entirely wanting; while the Mosasauroids, a group comparatively rare In the Old World, replace them in this country, and are abundantly represented by several genera, and numerous species.Recent explorations in the Cretaceous deposits of the Atlantic border, and in the region west of the Mississippi have resulted in the discovery of many new forms of this peculiar type of reptilian life, and furnished material for a more satisfactory study of its structure and affinities, which have so long remained in doubt.The investigations already made by Professors Leidy, Cope, and others have removed many lillcertainties in regard to the true nature of these reptiles, and disclosed affinities with other groups, before unsuspected.The interesting remains of Mosasaurus and its allies, which are briefly characterized in the present paper, promise to throw much additionallight on this subject, and will be described in full, with illustrations, at an early day.Mosasaurus princeps Marsh, sp.nov .. This species is indicated by the most important parts of a skeleton which is perhaps the largest hitheIto found in this country, as when entire the animal was probably not less than seventyfive feet in length.The remains are In an excellent state of preservation, and among them are the greater portion of the skull, with the maxillary teeth; one perfect quadrate bone; one mandible, nearly complete, with many of the teeth, and the posterior portion of the other; about twenty vertebrre, and several bones of the extremities.The teeth are smooth or very slightly facetted, and much curved inward and backward, especially in the posterior part of the jaws.The external pedicle of the crown is short, and its surface very concave.The dorsal vertebrre are very cylindrical; the caudals slightly flattened below, and furnished WIth anchylosed chevron bones.The ribs preserved are most of them cylindrical and slender like those of serpents, but are not hollow.Some of the smaller ones, apparently from the posterior dorsal region, are flattened transversely, and have the articular head nearly round, and slightly convex.The suspensorium of the quadrate bone is clasped by the prootic above, and the exoccipital below, and the squamosal fonna the greater part of the glenoid cavity.The
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Authors O. C. Marsh
Journal american journal of science
Year 1869
DOI
10.2475/ajs.s2-48.144.392
URL
https://doi.org/10.2475/ajs.s2-48.144.392
Keywords Keywords not found

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