. Carnegie Institution of Washington publication. . Vertebral. Length. Width. IV v^ \js 74. Figs. 73-75.—Chisternon undatum. Skull of No. 5962 A. M. N. H. xi. 73. Skull seen from above. 74. Skull seen from below. 75. Right half and tip of lower jaw. No. 5959 (fig. 72) was obtained at Grizzly Buttes, Wyoming, in 1903. The axial length of the carapace is 455 mm.; its width, 400 mm. As in No. 3932, there is a broad depression along the midline of the carapace. There is a distinct nuchal bone, followed by a larger preneural. There are 6 vertebral scutes, whose dimensions are given in the accompany
. Carnegie Institution of Washington publication. . Vertebral. Length. Width. IV v^ \js 74. Figs. 73-75.—Chisternon undatum. Skull of No. 5962 A. M. N. H. xi. 73. Skull seen from above. 74. Skull seen from below. 75. Right half and tip of lower jaw. No. 5959 (fig. 72) was obtained at Grizzly Buttes, Wyoming, in 1903. The axial length of the carapace is 455 mm.; its width, 400 mm. As in No. 3932, there is a broad depression along the midline of the carapace. There is a distinct nuchal bone, followed by a larger preneural. There are 6 vertebral scutes, whose dimensions are given in the accompanying table. There is a small supernumerary costal scute on each side of the first vertebral scute and another on each side of the second (fig. 72). The border of the shell over the right bridge is crusht, but the costo-marginal sulci appear to have run not more than 60 mm. above the border of the shell. The entoplastron is 80 mm. long and about 48 mm. wide. On the right bridge are five inframarginals. The left bridge is missing. No. 5962 was collected at Grizzly Buttes, in 1903. It was lying close to No. 5961, a specimen ot C. hebraicum. The cara- pace is much crusht laterally and diagonally. The specimen is valuable because it furnishes the skull. The carapace was at least 460 mm. long. So far as can be determined, the costo-marginal sulci pursued their courses above the bridges at a moder- ate height. There are 6 vertebral scutes and a pair of supernumerary costals in front. There are traces of the suture between the nuchal and the preneural. Most ot the dimensions of the skull (figs. jt„ 74) are presented on page 89. It differs from that of (7. hebraicum especially in the broader triturating surfaces of the maxillae and the broader 35 36 44 9-* 95 95 °5 97 °5 96 69 105. 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 th
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