. Carnegie Institution of Washington publication. BAENIDiE. 87 pedicels of the quadrates. There appears to have been only a rudimentary ridge on the triturating surface. The sutures between most of the bones may be traced, but those separating the frontals from the parietals have not been observed. Nasals were quite certainly present, but they are broken away. The lower jaw is present (fig. 75). The triturating surface is trans- versely concave and 9 mm. wide. The tip of the jaw is damaged so that the length of rlu s\ mphysis can not be exactly determined; but it was not far from 15 mm. Chiste
. Carnegie Institution of Washington publication. BAENIDiE. 87 pedicels of the quadrates. There appears to have been only a rudimentary ridge on the triturating surface. The sutures between most of the bones may be traced, but those separating the frontals from the parietals have not been observed. Nasals were quite certainly present, but they are broken away. The lower jaw is present (fig. 75). The triturating surface is trans- versely concave and 9 mm. wide. The tip of the jaw is damaged so that the length of rlu s\ mphysis can not be exactly determined; but it was not far from 15 mm. Chisternon hebraicum Cope. Plate 21, figs. 3, 4; plate 23, fig. 1; text-figs. 76-87. Bum,1 hebraica, Cope, Palaeont. Bull. No. I, 1872, p. 463; Proc. Amer. Philos. Soc, xn, 1873, p. 4(1,;; 6th Ann. Report, U. S. Geol. Surv. Terrs., 1872 (1873), p. 62; Vert. Tert. Form. West, 1884, p. 146, plate xix, figs. 1, 2.âHay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 438. Ba'ena undata, Hay, Bull. Amer. Mus. Nat. Hist., xxi, 1905, p. 138, figs. 1-3. Professor Cope's tvpe of the present species consists of about two-thirds of the anterior portion of the carapace and the plastron. It was obtained by him in the Bridger Badlands along Cottonwood Creek, \\ voming, and hence in the level known as B. This tvpe is now in the U. S. National Museum at Washington. It appears to be necessary to correct some of Cope's measurements. The transverse axial width is given by him as 500 mm., but it is only 420 mm. Accordingly, Cope's figures are just one-third the size of nature. Cope's estimate of the length was also 500 mm., but the writer would make it only about 425 mm. In either case the shell is about as broad as long. The length of the anterior lobe of the plastron, to a line joining the bottoms of the axillary notches, is 125 mm. Its width is 14- mm. The bridges are 162 mm. wide. The hinder lobe has a basal width of 160 mm. As shown by Cope's figures, the nuchal and the anterior marginal scutes have
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