. Carnegie Institution of Washington publication. 24 NEW REPTILES AND STEGOCEPHALIANS FROM openings are the same as in No. 7469 and there is the same meeting of two distinct bones at the posterior edge and the same distinct articular element. Eight interclavicles were found in the same region as the skull of Bueltncria. Five of these are nearly complete; three are accompanied by more or less complete clavicles; three are represented by the posterior portion only. These bones are shown in figure 5, and plates 2 c, 3, and 4. It is evident that none of these forms is specifically identical with a
. Carnegie Institution of Washington publication. 24 NEW REPTILES AND STEGOCEPHALIANS FROM openings are the same as in No. 7469 and there is the same meeting of two distinct bones at the posterior edge and the same distinct articular element. Eight interclavicles were found in the same region as the skull of Bueltncria. Five of these are nearly complete; three are accompanied by more or less complete clavicles; three are represented by the posterior portion only. These bones are shown in figure 5, and plates 2 c, 3, and 4. It is evident that none of these forms is specifically identical with any of the described forms from the Upper Triassic of Europe, and it is probable that the difference is of generic value. Figure 6, copied from Fraas,1 shows the char- acteristic form of the interclavicles in Metoposaurus, Cyclotosaurus, and Afastodonsaurus. In comparing these with the interclavicles from the Texas Triassic, it is evident that there is a great difference in the proportions; in the American forms the posterior pro- longation is much less in relation to the anterior. In the specimen previously described as Metoposaurus jonesi, No. 3814 of the University of Michigan collection, the form most closely approaches that figured by Fraas as Metoposaurus in the shortness of the anterior process and the breadth as compared with the length, but the posterior process is much sharper and the sculpture is very different. In all of Fraas's figures-there is shown a strong posterior prolongation of the clavicles in the region of the articulation with the shoulder girdle, which is apparently absent in the Texas forms, though this is not absolutely certain, as all of the clavicles, except No. 3814, are imperfect in this FIG. 6.—Outlines of interclavicles and clavicles. A. Metoposaurus, after Fraas. B. Cyclotosaurus, after Fraas. C. Mastodonsaurus, after Fraas. The figures showing the outline of the interclavicles have all been reduced to the same scale on the single line
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