. Carnegie Institution of Washington publication. 4". FlGS. 532 AND 533.—Testudo quadrata. Epiplastral lip and nuchal of type. X §• 532. Epiplastral lip, upper surface. 533. Portion of nuchal bone. first costal scute; m. s. I, part of first marginal scute; nu. s, nuchal scute. All of the sulci present on the fragment are deeply imprest. The fragment of the nuchal (fig. 533) is not very instructive. It comes to an acute edge 111 front, and thickens backward to 31 mm. Portions of 3 scutes are shown—the nuchal, the first peripheral, and the first vertebral. The nu
. Carnegie Institution of Washington publication. 4". FlGS. 532 AND 533.—Testudo quadrata. Epiplastral lip and nuchal of type. X §• 532. Epiplastral lip, upper surface. 533. Portion of nuchal bone. first costal scute; m. s. I, part of first marginal scute; nu. s, nuchal scute. All of the sulci present on the fragment are deeply imprest. The fragment of the nuchal (fig. 533) is not very instructive. It comes to an acute edge 111 front, and thickens backward to 31 mm. Portions of 3 scutes are shown—the nuchal, the first peripheral, and the first vertebral. The nuchal had a length of 41 mm. Its width is indeterminable, but exceeded 17 mm. On the lower side of the bone the nuchal scute was con- siderably wider than above. Nothing can be determined regarding the dimensions of the other scutes. The sulci are deeply imprest and have raised borders. In its abruptly projecting lip this species resembles some- what T. ligonia found in the same region. The differences are, however, very obvious. As seen from the lower side ot the plastron, the gulo-humeral sulci of T. ligonia, departing from the free borders of the epiplastra, run backward and inward at an angle of about 45°with the midline, to end on the entoplastron. In T. quadrata the gulo-humeral sulci run across the epiplastra at a right angle with the midline and do not touch the entoplastron. In T. ligonia the lip, as seen on the upper side, continues backward on the epiplastra a distance even greater from a line joining the anterior ends of the gulo-humeral sulci than it does in front of this line. In T. quadrata, on the contrary, the lip extends behind the line mentioned a very short distance. Testudo cultrata Cope. Testudo cultratus, Cope, Pafeeont. Hull. No. 15, 1873, p. 6; Synop. New Tert. Vert., 1873, p. 19; Ann. Rept. U. S. Geol. and Geog. Surv. Terrs., 1873 (1874), p. 511; Vert. Tert. Form. West, 1884, pp. 762, 763, plate lxiii, figs. 1-3; Geol. Surv. Texas, 3d Ann. Rept.
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