File:The Quarterly journal of the Geological Society of London (12736510043).jpg

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694
PROF. OWEN ON THE RANK AND AFFINITIES IN
the one hand, and of the Ophidia on the other, is the upper part of
the fore end of the skull. Cuvier has pointed out and illustrated
the characters of this region in existing species of both orders, to
which I add, for my present aim, the analysis and a figure of the
corresponding part of the skull in a species of the Ophidia.
In this group, as exemplified in Python (fig. 13), the premaxillary
(22) constitutes the smallest element of the region in question. It is
a subquadrate or subtriangular ossicle, wedged into the fore part of
the vomers and nasals, touching behind the vertical wall formed by
the deflected median plates of the nasals (ib. 15), not interposed be-
tween the nasals, but contributing a little to the lower boundary of
the nasal apertures, which are parial and open obliquely upon
the fore part of the skull. The premaxillary is connected by elastic
ligaments with the fore ends of the maxillaries, not by suture with
those bones, which enjoy movements in the constricting serpents,
independent of the premaxillary. This ossicle, 22, in Python tigris
supports two teeth.
Fig. 13.
Fig. 14.
Python.
Upper surface of face.
Varanus.
In Lacertilia (fig. 14) the dentigerous part of the premaxillary (22)
answers to the whole of that bone in Ophidia ; but it is relatively
broader, contributes a greater proportion to the fore end of the
skull, and is immovably joined by suture, on each side, to the max-

illaries (2i). The most distinctive feature of the premaxillary is the
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Source https://www.flickr.com/photos/biodivlibrary/12736510043
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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35818871
Item ID
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110705 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 694
Names
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NameFound:Lacertilia NameConfirmed:Lacertilia EOLID:1704 NameBankID:655694 NameFound:Varanus NameConfirmed:Varanus EOLID:11007261 NameBankID:2547085
BHL Page URL
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https://www.biodiversitylibrary.org/page/35818871
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 33 (1877).
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Flickr posted date
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24 February 2014
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This file comes from the Biodiversity Heritage Library.

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