A new Cretaceous bird allied to Hesperornis.

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ID: 294364
1893
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Abstract
THE genus Hesper'o1'nis and its near allies have hitherto been found only in a definite horizon, the Pteranodon beds, in the Cretaceous of Kansas, and all now known have been described and figured by the writer.*Recent researches in the Cretaceous of Montana have brought to light another form distinct from I£espe1'01'nis, and of smaller size, but evidently belonging to the same gel1eml group of gigantic swimming birds.A. single specimen only has been fonnd, associated with marine fossils of Fox Hills types, and certainly from a much higher horizon than that in which llespel'O'l'nis occurs.The specimen secm'ed is represented one-half natural size in the figures below, and is a most characteristic part of the skeleton.It is the lower half of the right tibia of a fully adult bird.It shows that the tibia as a whole was very long and slender, with the shaft hollow throughont.In its general featm'es, the specimen I'esembles most nearly the corresponding part in lfespeJ'ornis.The general proportions of the two are similar.The cavity in the shaft of each is equally extensive, and if' bounded by smooth, well-defined walls.The ridge for the fibula is equally developed, indicating that this bone was proportionately of the f'ame length in both, and probably of the same form.
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Authors O. C. Marsh
Journal american journal of science
Year 1893
DOI
10.2475/ajs.s3-45.265.81
URL
https://doi.org/10.2475/ajs.s3-45.265.81
Keywords Keywords not found

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