. Carnegie Institution of Washington publication. . Fig: 426 and 427.—Echmatemys cyane of type. Xi- 426. Upper surface of epiplastral lip. 427. Upper surface of left side of hinder lobe. Plastr tress of the latter did not project so tar trom the inner surface ot the carapace and was thinner. In E. wyomingensis, as represented by No. 5987, at a point 20 mm. below its summit, the but- tress projects inward from its articulation only 9 mm.; in E. cyane it projects inward 23 mm., a difference hardly to be regarded as merely individual. The plastron (fig. 425) had a length very close to 325 mm. On
. Carnegie Institution of Washington publication. . Fig: 426 and 427.—Echmatemys cyane of type. Xi- 426. Upper surface of epiplastral lip. 427. Upper surface of left side of hinder lobe. Plastr tress of the latter did not project so tar trom the inner surface ot the carapace and was thinner. In E. wyomingensis, as represented by No. 5987, at a point 20 mm. below its summit, the but- tress projects inward from its articulation only 9 mm.; in E. cyane it projects inward 23 mm., a difference hardly to be regarded as merely individual. The plastron (fig. 425) had a length very close to 325 mm. On account of the absence of some fragments which connected parts which are present, the exact length can not be deter- mined. The length of the anterior lobe was very close to 90 mm.; the width was not tar trom 130 mm. The epiplastral lip has a width of 54 mm. It projects but slightly beyond the general outline ofthelobe. It is truncated, with an acute free border. The lateral portion con- sists of a stout tooth separated from the remainder of the lip by a deep slit. On the upper side the thickening ot the epiplastrals (fig. 426) extends backward from the free border a distance of 28 mm. The epiplastrals are nowheregreat- ly thickened,the maximum beingll mm. The entoplastron had a length close to 49 mm., and the width has been 56 mm. It is rounded in front and behind. The bridge has a width of 132 mm. The plastral bones are 21 mm. thick at the crossing of the median longitudinal and the hyohypoplastral sutures. The hinder lobe has a length of 113 mm. The width appears to have been about 146 mm. The beveled surfaces on the upper side of the lobe (fig. 427) have a width of 28 mm. at the hypoxiphiplastral sutures, of which width 21 mm. were covered with horny scutes. The thick- ness of the bones at the sutures just mentioned is 12 mm. The inguinal buttresses send their bases inward from the free borders of the posterior lobe a distance of about ]^ mm., almost half the distance to
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