New characters of mosasauroid reptiles

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Abstract
THE Mosasauroid reptiles are so rare in Europe that the type specimen described by Ouvier still remains the most perfect yet discovered there, and the only one from which important characters have been made out.In this country, however, this group attained a marvEllous development, and was represented by several families, and numerous genera and species, The abundance of specimens is perhaps best illustrated by the fact that the Museum of Yale Oollege contains remains of not less than 1,400 distinct individuals.In not a few of these, the skeleton is nearly if not quite complete, so that every part of it::; structure can be determined with almost absolute certainty.From this 'store of material, I have already made out various characters of these reptiles,* and in the "present communication several others are recorded, which have escaped the atten• tion of previous observers.The subject is by no means exhausted. THE STERNUM.The absence of a sternum has been asserted by Oope to be one of the important characters of the Mosasauroid reptiles,t and this statement has been accepted by some authors.Several specimens, however, in the Yale Museum, one of which is figured in Plate I, figure 1, prove the contrary, and indicate the presence of a sternum in the entire group.The most perfect specimens of the Mosasauroid sternum preserved pertain to the genus Edestosaurlls, and are of the true Lacertian type.The sternum in this genus is narrow, and elongate in form, and nearly or quite symmetrical, as shown in Plate I, figure 1.It is thin, slightly concave above, and convex below.Its antero-lateral margins are short and rounded, and have distinct grooves fOI' the coracoids.The costal margins are much longer, and converge posteriorly.Each has facets for five sternall'ibs, and, behind these, false ribs were supported by a partially ossified pedicle, which joined the end of the sternum.The ossification of the sternum was by endostosis .
Reference Key
openalex_W2322211497 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors O. C. Marsh
Journal american journal of science
Year 1880
DOI
10.2475/ajs.s3-19.109.83
URL
https://doi.org/10.2475/ajs.s3-19.109.83
Keywords Keywords not found

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