. Carnegie Institution of Washington publication. . Figs. 3 and 4. Trachemys scripta. 3. Skull seen from above. XI. fr, frontal; ju, jugal; pa, parietal; paoc, paroccipital; pfr, prefrontal; pof, post- frontal; pro, prootic; qu, quadrate; sq, squamosal; soc, supraoccipital. 4. Skull seen from below. XI. alv, alveolar surface of maxilla; hoc, basioccipital; bsp, basisphenoid; exoc, exoc- cipital; , maxilla; pal, palatine; paoc, paroccipital; pmx, premaxilla; pro, prootic; pt, pterygoid; qu. art, articulation of quadrate with lower jaw; qj, quadratojugal; sq, squamosal; vom, vomer. completely
. Carnegie Institution of Washington publication. . Figs. 3 and 4. Trachemys scripta. 3. Skull seen from above. XI. fr, frontal; ju, jugal; pa, parietal; paoc, paroccipital; pfr, prefrontal; pof, post- frontal; pro, prootic; qu, quadrate; sq, squamosal; soc, supraoccipital. 4. Skull seen from below. XI. alv, alveolar surface of maxilla; hoc, basioccipital; bsp, basisphenoid; exoc, exoc- cipital; , maxilla; pal, palatine; paoc, paroccipital; pmx, premaxilla; pro, prootic; pt, pterygoid; qu. art, articulation of quadrate with lower jaw; qj, quadratojugal; sq, squamosal; vom, vomer. completely co-ossified with its fellow of the opposite side at the symphysis. On the lower border of the jaw this bone extends backward nearly to the articulation with the quadrate. The upper border of the jaw, behind the triturating surface, is formed in front by the coronoid bone; posteriorly by the supraangular. These two bones are to be seen both from the outside and from the inside of the jaw. Behind the supraangular is a nodular bone that articulates with the quadrate, the articular. On the inner surface of the jaw, near the hinder end, are two bones, whose names are in dispute. Baur (Anatomischer Anzeiger, xi, 1896, p. 413) calls the lower of the two the splenial, the upper the angular. Williston (Science, xvm, 1903, p. 830) regards the lower bone as the angular, the upper as a dermal articular. The same author has, in his work on North American Plesiosaurs, 1903, page 30, called the latter bone the prearticular, and this name is adopted by the present writer. The shoulder-girdle of an emyd turtle consists of two bones on each side. One of these, the scapula, consists of two slender portions placed at nearly a right angle with each other. The longest portion, the proper scapula, the body of the scapula,. 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 n
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