. Carnegie Institution of Washington publication. 332 FOSSIL TURTLES OF NORTH AMERICA. As shown by the fifth, seventh, and eighth peripherals the costo-marginal sulci ran near the costo-peripheral sutures, being distant 8 mm. or less. As stated previously, the plastron (fig. 436) has a total length of 300 mm. The anterior lobe measures 87 mm. in length and has a width of 124 mm., the length thus being 70 per cent, of the width. It contracts a little in front of the axillary notch, then runs directly forward some distance in front of the hyoepiplastral sutures, then curves rapidly to the lip. T
. Carnegie Institution of Washington publication. 332 FOSSIL TURTLES OF NORTH AMERICA. As shown by the fifth, seventh, and eighth peripherals the costo-marginal sulci ran near the costo-peripheral sutures, being distant 8 mm. or less. As stated previously, the plastron (fig. 436) has a total length of 300 mm. The anterior lobe measures 87 mm. in length and has a width of 124 mm., the length thus being 70 per cent, of the width. It contracts a little in front of the axillary notch, then runs directly forward some distance in front of the hyoepiplastral sutures, then curves rapidly to the lip. The latter is 49 mm. wide. On each side it presents a stout tooth. Behind these teeth the thickness of the bones is 11 mm. The thickened portion of the epiplastral (fig. 437) continues backward 26 mm. Outside of the gular sutures, on the upper side, the horn-covered surface is 18 mm. wide, increases to 20 mm., and is reduced at the hyoepiplastral suture to 16 mm. The entoplastron is 35 mm. long and 60 mm. wide. The anterior buttresses arise some 15 mm. or more within the border of the anterior lobe and rise to a height of at least 63 mm. They are about 30 mm. wide and 7 mm. thick. The width of the bridge is 132 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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