. Carnegie Institution of Washington publication. THALASSEMYDIDJE. H7 Width. !' Length free border. Height at sulcus. Lower face. Inner face. 53 1 71 5* 9 ; 75 49 '5 47 3 7° 27 37± 4 73 19 ;- 5 6 86 5' 4' 57 7 88 58 5° 19 8 90 68 65 20 9 88 52 'â 4 10 > 1 80 95 this as a mistake. After passing about 6 mm. the sulcus between the nuchal scute and the hist marginal, the sulcus between the nuchal and the vertebral scutes suddenly becomes very shallow, but the writer believes that it continues on in its usual position. \ considerable part of the suprapygal (fig. 173) is missing. Cope's statem
. Carnegie Institution of Washington publication. THALASSEMYDIDJE. H7 Width. !' Length free border. Height at sulcus. Lower face. Inner face. 53 1 71 5* 9 ; 75 49 '5 47 3 7° 27 37± 4 73 19 ;- 5 6 86 5' 4' 57 7 88 58 5° 19 8 90 68 65 20 9 88 52 'â 4 10 > 1 80 95 this as a mistake. After passing about 6 mm. the sulcus between the nuchal scute and the hist marginal, the sulcus between the nuchal and the vertebral scutes suddenly becomes very shallow, but the writer believes that it continues on in its usual position. \ considerable part of the suprapygal (fig. 173) is missing. Cope's statement that it is only 2 inches and 4 lines wide is an error or meant to apply to some other bone. The bone in question is at least 110 mm. wide. It occupies an area that in O. gibbi is occupied by two bones, but a close examination shows a line running from the upper angle of one eleventh peripheral to that of the opposite side, along which 2 bones have co-ossified. The angulation of the upper border of the eleventh peripheral shows that there were two suprapygals. It is probable that the sutural edge of the eleventh peripheral joined the anterior suprapygal instead of the eighth costal plate. The dimensions of the peripherals are shown in the table. The sixth peripheral (figs. 174,175) presents three faces, an upper concave, a lower convex, and an inner irregular. The upper and lower faces meet at the acute free border. In the inner face is a large, somewhat flattened pit for the end of a rib. Its mouth occupies one- half the length of the face. Along the lower border of the face are two or three shallow pits tor digitations of the hypoplastron. As we proceed forward from the sixth peripheral the free border becomes less acute, until, on the third, it is obtuse and the upper, now convex, face rounds into the lower. On the second and first peripherals (figs. 176, 177) the lower face becomes the obtuse free border of the bones. The inner faces of the fourth and the third co
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