File:The biology of the amphibia (1931) (20194348038).jpg

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Title: The biology of the amphibia
Identifier: biologyofamphibi00nobl (find matches)
Year: 1931 (1930s)
Authors: Noble, Gladwyn Kingsley, 1894-1940
Subjects: Amphibians
Publisher: New York : McGraw-Hill
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries

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218 THE BIOLOGY OF THE AMPHIBIA and short prevomers of frogs. Primitive salamandrids with long maxillae, such as Tylototriton, have palates which are essentially like those of frogs (Fig. 80). On the other hand, Ascaphus, some species of Scaphiopus, and various other Salientia may lack the quadratojugal and hence have a skull outline resembling that of the salamandrid, Pachytriton, closely.
Text Appearing After Image:
A B Fig. 81.—Palates of a frog and a salamander with reduced maxillae. In most salamanders the maxillae fail to reach the quadrate and a quadratojugal is missing. In some frogs, such as Ascapfius truer (A), the same condition maintains. Salamanders also specialize in the backward growth of the vomerine bones. In the plethodontids, the posterior processes of these may become separated as the two dentigerous patches shown in Plethodon glutinosus (B). C.Pt., cartilaginous pterygoid; Mx., maxilla; P.Mx., premaxilla; Ps., para- sphenoid; Pt., pterygoid; P.T., palatine tooth patches; P.Vo., prevomer; Qu., quadrate; Vert.I., first vertebra. With the flattening of the skull and the widening of the inter- pterygoid vacuities, the pterygoid underwent considerable change in form. A row of bones which formed a dorsal cover to the palatoquadrate bar of osteolepids and probably represented the metapterygoid and mesopterygoid of teleosts was reduced in the first tetrapods to a single bone. This bone articulated with

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  • bookid:biologyofamphibi00nobl
  • bookyear:1931
  • bookdecade:1930
  • bookcentury:1900
  • bookauthor:Noble_Gladwyn_Kingsley_1894_1940
  • booksubject:Amphibians
  • bookpublisher:New_York_McGraw_Hill
  • bookcontributor:ASC_York_University_Libraries
  • booksponsor:York_University_University_of_Toronto_Libraries
  • bookleafnumber:236
  • bookcollection:YorkUniversity
  • bookcollection:ontario_council_university_libraries
  • bookcollection:toronto
  • BHL Collection
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7 August 2015
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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.

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