Philosophical Transactions of the Royal Society of London Volume 167, PT. 2; V. 167.cSoviet Union
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Author: Soviet Union
Number of Pages: 162 pages
Published Date: 14 Jan 2013
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: Pdf
ISBN: 9781234119713
Download Link: Philosophical Transactions of the Royal Society of London Volume 167, PT. 2; V. 167
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ...same time during the latter part of larval life, they were distinct. The curious behaviour of the dentigerous palatine, after it has once become independent of the vomer, may be traced in all the higher Urodeles. We have seen that in Siredon this bony tooth-bearing plate sent backwards and outwards an edentulous process, and that that untoothed part became the larger bone by far, and was segmented from the part from which it sprung. The same thing has taken place here; but Seironota agrees with most Caducibranchs in having its dentigerous palatine become confluent with the end of the vomer just where it has retained a few teeth, and not turned outwards, as in Amblystoma. All the fore part of each vomer is now a large toothless blade of bone, forming, with its fellow, much of this very strong, hard palate, and elegantly notched at its side for the inner nostril. The sutures on this palate, like the bony plates, are of great extent; the edges of each vomer are denticulated; but on the whole the vomer is just more than right-angled, where it fits between the premaxillary and maxillary palatine plates. Behind the middle nasal canal the left vomer binds strongly on the right; they both then pass insensibly into the long, divaricating, dentigerous palatine. Thus we have, from the ethmoidal region to the ear-capsule, a bony tract whose outer outline is concave or creseentic; behind the middle there is nothing but a steep ridge of bone bearing teeth. These bars reach to the basitemporal angle of the parasphenoid (pas); and if we look at the larval skull (figs. 1 & 2) we shall see that these tooth-tracts run along the trabecular line even then. Whilst giving off the bony pterygoid plate the palatines turned outwards, and then loosing...
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