File:Geological magazine (1887) (14582047000).jpg

Identifier: geologicalmagazi341887wood (find matches)
Title: Geological magazine
Year: 1864 (1860s)
Authors: Woodward, Henry, 1832-1921
Subjects: Geology
Publisher: London (etc.) Cambridge University Press
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ces of ganoine upon the surface. Internal Cranial Bones. — There is a large parasphenoid muchresembling that of Acipenser in shape; but, unlike Prof. Young, Ican find no remains of ossification in the chondrocranium, which canbe described, or even relied upon as being such. Although suchossifications may very likely have existed, it seems very improbablethat they attained any considerable dimensions. Hyoid Arch.—The most easily recognized bone of the entire headis the hyomandibidar (7j. m. Figs. 2 and 5), which passes from thesquamosal region obliquely downwards and backwards. It is shapedmuch as it is both in Acipenser and Polyodon, being constricted inthe middle and flattened anteroposteriorly in its upper part, laterallyin its lower. In one specimen in the British Museum there is anappearance as of an ossified symplectic, extending from the lowerextremity of the hyomandibular towards the articulation of themandible ; this I do not insist upon, as it is not corroborated by any I
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252 Dr. R. H. Traquair—On Chondrosteus acipenseroides. other specimen, though the existence of a cartilaginous one may besafely assumed considering the large space between the lowerextremity of the hyomandibular and the articulation of the lowerjaw. The ceratohyal (c. h. Figs. 2, 3, and 5) is also very easily recog-nizable, and requires no special description.

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