. Carnegie Institution of Washington publication. K;4 FOSSIL TURTLES OF NORTH AMERICA. Millimeters. Extreme length of ramus of low er jaw 37° Extreme length of symphysis of lower jaw ioo Length of skull from beak to end of supraoccipital spine 580 Median length of narial opening 75 Width of narial opening 55 \im to-posterior length of orbit 120 It will be observed that this skull was nearly 2 feet in length. In Wieland's figure the suture between the parietals was omitted; but this is here supplied. It is unfortunate that only a portion of the nuchal was preserved. Its presence would have sett
. Carnegie Institution of Washington publication. K;4 FOSSIL TURTLES OF NORTH AMERICA. Millimeters. Extreme length of ramus of low er jaw 37° Extreme length of symphysis of lower jaw ioo Length of skull from beak to end of supraoccipital spine 580 Median length of narial opening 75 Width of narial opening 55 \im to-posterior length of orbit 120 It will be observed that this skull was nearly 2 feet in length. In Wieland's figure the suture between the parietals was omitted; but this is here supplied. It is unfortunate that only a portion of the nuchal was preserved. Its presence would have settled the question regarding the identity of the T-shaped bone, which has been regarded as the nuchal. The portion of the nuchal (fig. 248, nu. p) remaining with this specimen does not, the writer believes, particularly favor the opinion that it is the T-shaped bone. No. 1393 of the Carnegie Museum was obtained at Twin Butte Creek, Logan County, Kansas. It is fragmentary, but presents various portions of the plastron, limbs, and skull. z 1. FlG. 249.—Vrotostega gigas. XiV Carapace of No. 1420 Carnegie Museum. 1-10, the ribs of the carapace; s, sacral rib. Some series ot the peripherals show that there was a sharp free border along each side. From this a plate of bone from 50 to 70 mm. wide rose over the distal ends of the ribs. From the same border another plate, from 25 mm. to 30 mm. wide, past horizontally inward below the rib-ends. Fhe hyoplastron and the hypoplastron taken together measure about 400 mm. in length. The greatest thickness of the hyoplastron is about 15 mm. The hypoplastron is sunn what thinner. Both xiphiplastra are present. They are of the form shown in Case's figure, but they are not so abruptly bent. Little is known regarding the vertebrae of this species. Cope had remains of 5, but he was unable to determine where they belonged. They probably appertained to the tail. Cope supposed that the dorsal vertebra; possest transverse processes, but Wieland's figu
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