. Carnegie Institution of Washington publication. . Figs. 172 and 173.—Osteopygis platylomus. Portions of type. 172. Part of a neural. X§. 173. Pygal, suprapygal, and tenth and eleventh peripherals. Xi. most of the suprapygal, a portion of the nuchal, wholes or parts ot all the peripherals of the right side, except the fifth, wholes or parts of the first, third, sixth, eighth, ninth, tenth of the left side, many fragments of costals and portions of the plastron. It appears that a few parts have been lost since Cope described the specimen. Cope estimated the length of the carapace at 2 feet 2 i
. Carnegie Institution of Washington publication. . Figs. 172 and 173.—Osteopygis platylomus. Portions of type. 172. Part of a neural. X§. 173. Pygal, suprapygal, and tenth and eleventh peripherals. Xi. most of the suprapygal, a portion of the nuchal, wholes or parts ot all the peripherals of the right side, except the fifth, wholes or parts of the first, third, sixth, eighth, ninth, tenth of the left side, many fragments of costals and portions of the plastron. It appears that a few parts have been lost since Cope described the specimen. Cope estimated the length of the carapace at 2 feet 2 inches. The writer regards the length as having been close to 30 inches or about 750 mm. The fragment of neural (fig. 172) is crost by a sulcus and is therefore probably either the thud or the fifth. It is deeply notcht in front for the preceding neural, and this notch gives evidence that the neural was not the first one. The greatest width of the bone is 56 mm. The bone described by Cope as the "posterior vertebral" is really the suprapygal. Only a portion of the left end of the nuchal remains. It is articulated to a portion of the first left peripheral. The tree edge is obtuse and at the suture with the first peripheral the thickness is 17 mm. The bone extends backward from the free border a little more than 60 mm., to articulate with the first costal. Here the thickness is only about 6 mm. The first marginal scute occupies the outer end of the nuchal and the anterior end of the first peripheral. Along the free border it is 58 mm. and it extends backward from the free border of the bone ^^ mm. Cope states that the nuchal scute was confluent with the first vertebral; but the writer regards. 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 I
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