. Carnegie Institution of Washington publication. 2 74 KOSSII. TURTLES OK NORTH AMERICA. The choanae are far forward. The roof of the mouth in front is vaulted, not greatly unlike that of a Testudo. The vomer apparently extended between the palatines to the pterygoids or very close to them. The distance across the palatines, at their hinder ends, is 20 mm. The distance across the constricted portion of the pterygoids is 13 mm. There are posterior palatine foramina. The lower jaw, as shown by the American Museum specimen, had a single sharp cutting-edge, which workt against that of the upper ja
. Carnegie Institution of Washington publication. 2 74 KOSSII. TURTLES OK NORTH AMERICA. The choanae are far forward. The roof of the mouth in front is vaulted, not greatly unlike that of a Testudo. The vomer apparently extended between the palatines to the pterygoids or very close to them. The distance across the palatines, at their hinder ends, is 20 mm. The distance across the constricted portion of the pterygoids is 13 mm. There are posterior palatine foramina. The lower jaw, as shown by the American Museum specimen, had a single sharp cutting-edge, which workt against that of the upper jaw. The lower jaw appears to have formed a beak in front. The symphysis is short, about 12 mm. in length. The jaw is 20 mm. high at the coronoid region. The right humerus is present in the Yale specimen, and complete except that the radial tuberosity is broken off. The length from the proximal surface of the head to the distal end is 83 mm. The greatest diameter of the head is 21 mm. The ulnar tuberosity is as large as that of Chelydra. The angle between the two tuberosities is nearly the same as in Chelydra. The ectepicondylar foramen also resembles that of the genus just named. The distal articular surface appears to have been bent toward the palmar surface more than in Chelydra. The ulna is like that of Chelydra, but is, relatively to the length ot the humerus, longer than in the genus named. It is likewise thicker from the dorsal to the palmar surface. The length is 55 mm.; the least breadth, 8 mm. The distal end is 19 mm. wide. The dorsal surface is strongly markt by ridges for the attachment of muscles. About two-thirds of the radius is preserved. Some portions of the hinder limbs are preserved, wholly or partly; but they have not been completely removed from the matrix. The right astragalo-calcaneum was found in the right axillary notch. It resembles that of Chelydra, but has the fibulare co-ossified with it. The vertebra are represented by portions of two cervicals, but
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