. Carnegie Institution of Washington publication. '32 FOSSIL TURTLES OF NORTH AMERICA. Osteopygis gibbi Wieland. Plate it>, fig. i; plate 27, figs. I, 2; text-figs. 142-146. Osteopygis gibbi, Wieland, Anier. Jour. Sci. (4), XVII, 1904, p. 118, plates v-viii and text-figs. 3-7. The type of this species is No. 783 of the Marsh collection of Yale University. It was obtained from the upper bed of Cretaceous greensand, at Barnesboro, Gloucester County, New Jersey, in 1870. It was originally studied by Dr. George Baur (Zool. Anzeiger, mi, 1889, p. 42), who determined from it that Cope had been in
. Carnegie Institution of Washington publication. '32 FOSSIL TURTLES OF NORTH AMERICA. Osteopygis gibbi Wieland. Plate it>, fig. i; plate 27, figs. I, 2; text-figs. 142-146. Osteopygis gibbi, Wieland, Anier. Jour. Sci. (4), XVII, 1904, p. 118, plates v-viii and text-figs. 3-7. The type of this species is No. 783 of the Marsh collection of Yale University. It was obtained from the upper bed of Cretaceous greensand, at Barnesboro, Gloucester County, New Jersey, in 1870. It was originally studied by Dr. George Baur (Zool. Anzeiger, mi, 1889, p. 42), who determined from it that Cope had been in error when he stated that the genus Osteopygis possest 10 pairs of costal plates. Fig. 1. plate 26, is reproduced from a drawing prepared under Baur's direc- tions and shows the nuchal, the periph- erals, and the pygal as seen from below. In 1904 the specimen was full)' prepared and the parts put together under the direction of Dr. Wieland. A number of the figures made by Dr. W7ieland are here reproduced. The specimen is the most complete that is known of anyspeciesof thefamilv and it serves to give us a clear idea of the form and the constituents of the shell. It will be observed that the out- line of the carapace as restored by Dr. Baur (plate 26, fig. 1) differs from that as restored by Wieland (text-fig. 142!. Since, however, Dr. W7ieland fitted the costals to one another and to the periph- erals, and brought the plastron into relation with the carapace, which Baur did not do, it is quite certain that the later restoration is the more accurate one. It can hardly be wrong except in small details. Fig. 143 shows the shell from the side. In form the carapace is elongated oval, rounded in front and somewhat pointed behind. It is somewhat deprest and especially the hinder peripherals look more upward than outward. The length in a straight line is given as 690mm.; the extreme width, as about 580 mm. The nuchal bone is 127 in front and has a maximum width ol 145 mm. Its l
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