. The biology of the amphibia. Amphibians. THE SKELETON 217. Fig. 80.—Palates of a salamander and a frog showing the fundamental resemblances in skull structure. The chief difference is that in the salamander, Tylototriton verrucosus {A), the prevomers have grown back along either side of the parasphenoid, while in the frog, Rana adspersa (B), these bones retain their primitive position. Frogs are also primitive in retaining their quadratojugal which is lost as a separate element in the urodeles. The triradiate pterygoid is an inheritance from Carboniferous ancestors. Ex. Oc, exoccipital; Mx.,
. The biology of the amphibia. Amphibians. THE SKELETON 217. Fig. 80.—Palates of a salamander and a frog showing the fundamental resemblances in skull structure. The chief difference is that in the salamander, Tylototriton verrucosus {A), the prevomers have grown back along either side of the parasphenoid, while in the frog, Rana adspersa (B), these bones retain their primitive position. Frogs are also primitive in retaining their quadratojugal which is lost as a separate element in the urodeles. The triradiate pterygoid is an inheritance from Carboniferous ancestors. Ex. Oc, exoccipital; Mx., maxilla; , premaxilla; Ps., parasphenoid; Pt., pterygoid; , prevomer bearing the vomerine teeth; , Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Noble, Gladwyn Kingsley, 1894-1940. New York : McGraw-Hill
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