File:On the anatomy of vertebrates (electronic resource) (1866) (14568824710).jpg

Identifier: b20416039_001 (find matches)
Title: On the anatomy of vertebrates (electronic resource)
Year: 1866 (1860s)
Authors: Owen, Richard, 1804-1892
Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds
Publisher: London : Longmans, Green
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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theskull may be seen, in the Perch, fig. 84, the basioccipital 1, thearticular processes of the exoccipitals 2, and the spine-shaped endof the superoccipital 3. The paroccipital 4, is separated belowfrom the exoccipital by the petrosal 16. The basi-presphenoid, 5and 9, carries forward the bodies of the vertebras to the vomer 13,which is expanded and dentigerous anteriorly, as the bodies ofthe cervical vertebrae support teeth in the Deirodon (p. 57). Thealisphenoids 6, the orbitosphenoids 10, and the prefrontals 14, areattached to the sides of the basal elements; more externally areseen the frontal 11, postfrontal 12, mastoid 8, and paroccipital 4.On the left side are shown the palatine 20, the entopterygoid ANATOMY OF VERTEBRATES. 105 23, and external to it the pterygoid abutting upon the hypotym-panic, 28 d: between this and the epitympanic, 28, are themesotympanic, 38, and the pretympanic b. The preopercular, 34,runs parallel with, strengthens, and connects together the divisions 84
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Base of the skull with left side of mandibular arch and its opercular appendage, Perch (Perca fluviatilis) of the tympanic pedicle: it supports the opercular, 35, the sub-opercular, 36, and the interopercular, 37. In the mandibularramus the articular is marked 29, and the dentary 32. The freeend of the maxillary is seen at 21. In fig. 85 the maxillary and mandibular arches and appendagesare removed, the stylohyal, 38, having been detached from theepitympanic. It resumes its normal attachment to its segmentwhen the special branchial apparatus becomes abrogated, as inthe advanced batrachian, fig. 71, in which we saw the change ofposition, as contrasted with the earlier piscine condition of thelarva, fig. 69 A. In the complex and ossified hyoidean arch of 106 ANATOMY OF VERTEBRATES. fishes we find, after the stylohyal 33, the epihyal 39, the cerato-hyal 40, and basihyal 41; to which may be articulated a glosso-hyal 42, and a urohyal 43 : this is a large compressed lamelli-form bone in th

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