. Carnegie Institution of Washington publication. 218 FOSSIL TURTLES OF NORTH AMERICA. of the fragment, only 12 mm. The sutures are very jagged. Nearer one sutural border a sulcus descends, which separated two costal scutes. Two other costals measure each 72 mm. in width at the distal end. In all these the free end of the rib projected beyond the distal border. A nuchal is represented by the greater part including the entire front. There was an articular tuberosity for the eighth cervical; the anterior border of this bone was 200 mm. long. It is excavated somewhat for the neck and head. The up
. Carnegie Institution of Washington publication. 218 FOSSIL TURTLES OF NORTH AMERICA. of the fragment, only 12 mm. The sutures are very jagged. Nearer one sutural border a sulcus descends, which separated two costal scutes. Two other costals measure each 72 mm. in width at the distal end. In all these the free end of the rib projected beyond the distal border. A nuchal is represented by the greater part including the entire front. There was an articular tuberosity for the eighth cervical; the anterior border of this bone was 200 mm. long. It is excavated somewhat for the neck and head. The upper surface is quite convex from side to side. Antero-posteriorly the bone measures 96 mm. The front border is obtuse; behind it a short distance the thickness is 16 mm., increasing at the ends of the bone to 20 mm. The hinder border joined suturally the first costal bone. The first left peripheral is connected with the nuchal. It is no mm. long and 80 mm. wide. The hinder border articulated with the first costal. The free border is obtuse and the distal end is 18 mm. thick. There is present the proximal end of another left first peripheral which is considerably thicker than the one just described. What are evidently right and left second peripherals, of an individual smaller than either of the above, are present. The proximal end of the one of the left side is 65 mm. wide, whereas the distal end of the left first, described above, is 72 mm. wide; besides, the two do not fit. FlGS. 275-280.—Procolpochelys graniava. Various peripherals. X§. 275. Section across middle of supposed second peripheral; free border toward right. No. 1027 276. Section at anterior end of second peripheral. Princeton Univ. Coll. 277. Section near hinder end of third peripheral. Princeton Univ. Coll. 278. Section near front end of supposed fifth peripheral. Princeton Univ. Coll. 279. Right hinder peripheral, view above. Princeton Univ. Coll. 280. Upper surface of supposed eleventh peripheral.
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