. Carnegie Institution of Washington publication. 5o6 FOSSIL TURTLES OF NORTH AMERICA. in the American Museum of Natural History is 5930. The convexity and the outline of the carapace are very similar to those of the type. The front margin is somewhat more excavated than in the type, and the lateral borders are more sinuated. This is caused by the extension ot the sculptured layer out on the distal ends of the ribs. The length of the specimen is 450 mm.; the greatest width, 380 mm. The preneural is relatively broader anteriorly than in the type, and the sixth neural is not developt. In the lat
. Carnegie Institution of Washington publication. 5o6 FOSSIL TURTLES OF NORTH AMERICA. in the American Museum of Natural History is 5930. The convexity and the outline of the carapace are very similar to those of the type. The front margin is somewhat more excavated than in the type, and the lateral borders are more sinuated. This is caused by the extension ot the sculptured layer out on the distal ends of the ribs. The length of the specimen is 450 mm.; the greatest width, 380 mm. The preneural is relatively broader anteriorly than in the type, and the sixth neural is not developt. In the latter respect we may find variations in our living species of Trionychidae. With this specimen from Wyoming comes a considerable portion of the plastron. This includes the median halt ot the lett and a fragment of the right hyoplastron, and a considerable part of the right hypoplastron. These bones are thick and heavy, the thickness of the bones along the suture joining them on the narrowest part of the bridge being 16 mm. From this point the thickness is reduced each way to about 10 mm. at the median and outer borders of the bones. At the narrowest part of the bridge the width of the hyoplastron is 50 mm.; of the hypoplastron, 42 mm. The xiphiplastron has joined the hypoplastron by the usual two digitations. The lower surfaces of the hyoplastra and the hypoplastra are occupied by a. 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 the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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