. Carnegie Institution of Washington publication. . Figs. 488-492.—Stylet neb ylemys nebrascensis. 490. Skull ami humerus 491. 4SS. ( pper view of skull. Xl. No. 1571 Carnegie Museum. 489. Lower view of same. Xl. 490. Side view of same. Xl. 491. Right humerus, dorsal view. X5. No. 700 A. M. N. H. 4»)2. Right humerus, proximal end. Xj- surface there is a tootht ridge which runs parallel with the cutting-edge. In front, a longi- tudinal ridge runs backward from the symphysis, as in G. polyphemus, a character which has led to the separation of the North American species ot Testudo, to form the ge
. Carnegie Institution of Washington publication. . Figs. 488-492.—Stylet neb ylemys nebrascensis. 490. Skull ami humerus 491. 4SS. ( pper view of skull. Xl. No. 1571 Carnegie Museum. 489. Lower view of same. Xl. 490. Side view of same. Xl. 491. Right humerus, dorsal view. X5. No. 700 A. M. N. H. 4»)2. Right humerus, proximal end. Xj- surface there is a tootht ridge which runs parallel with the cutting-edge. In front, a longi- tudinal ridge runs backward from the symphysis, as in G. polyphemus, a character which has led to the separation of the North American species ot Testudo, to form the genus Gopherus. In Stylemys a less elevated ridge is developt on the inner border of the maxillary. The structure of the upper jaw is like that of Gopherus polyphemus, except that in Stylemys the masticatory ridges do not join the longitudinal ridge. As in Testudo and Gopherus, the palate is archt upward high above the level of the masticatorv surfaces; and there is a sharp ridge which, starting on the vomer, is continued backward to the hinder end of the latter bone and on the conjoined edges of the pterygoids. The width of the vomer, where it articulates with the premaxillaries and the maxillaries, is considerable, as it is also in G. polyphemus. In T. tabulate the vomer is narrow anteriorly and articulates only slightly with the maxillaries. The vaulted roof of the mouth continues backward as far as the bones of the skull are preserved, and judging from Testudo, to a line joining the front borders of the articular ends of the quadrates. In the specimen the vaulted roof has been forced upward and broken across the middle, and a portion of it is missing; but the hinder end of the vomer is present, and extended backward about 25 mm. from the anterior end. The palatines extend backward as far as the hinder end of the vomer. The nasopalatine and posterior palatine foramina have the same positions as in Gopherus. The former is rather small. The postfrontal and jugal bones are mis
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