. Carnegie Institution of Washington publication. IdXOCHELYlDiE. 169 B. F. Mudge, in the Niobrara deposits of Kansas, near the forks of the Smoky Hill River. The animal was a large one, since the mandible, from the symphysis to the angle of the jaw, measures 157 mm. In 1877, as cited in the synonymy, Professor Cope came into possession of 2 nearly complete skulls, which he identified as belonging to T. latiremis, and these he described. These skulls are now in the American Museum and bear respectively the numbers 1496 (fig. 202) and 1497 (figs. 203, 204). The latter (and probably both specimen
. Carnegie Institution of Washington publication. IdXOCHELYlDiE. 169 B. F. Mudge, in the Niobrara deposits of Kansas, near the forks of the Smoky Hill River. The animal was a large one, since the mandible, from the symphysis to the angle of the jaw, measures 157 mm. In 1877, as cited in the synonymy, Professor Cope came into possession of 2 nearly complete skulls, which he identified as belonging to T. latiremis, and these he described. These skulls are now in the American Museum and bear respectively the numbers 1496 (fig. 202) and 1497 (figs. 203, 204). The latter (and probably both specimens) was collected somewhere along the Smoky Hill River. A comparison of the lower jaws of these skulls with that of the type makes it certain that the former were correctly referred. The first publisht figure of the skull of this species was made by Hay, as cited. This skull lackt the lower jaw; but a comparison with the skulls described by Cope reveals no differences. Other skulls have been figured by Case and Williston, as cited. This appears to have been the commonest turtle in the Niobrara beds of Kansas, yet many parts of its skeleton remain unknown. The size attained was considerable. If the length of the coracoid bore the same relation to the length of the carapace that subsists between these bones in Chelydra 01 Caretta, the carapace must have been about a meter in length. It may be remarkt here that the coracoid of Cope's type was 225 mm. long, that author's statement that it was 250 mm. being incorrect. The ramus of the mandible has a length of 157 mm., so that the skull, from the tip of the snout to the occipital condyle, was close to 160 mm. The skull of this species is broad posteriorly. In front of the quadrates the width is gradually reduced, so that the head is wedge-shaped and the snout pointed. Altho all the skulls yet found are considerably flattened by pressure, it is quite certain that the head was rather deprest, more like that of Chelydra than like that of
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