Carapace much depressed, feebly keeled. Nuchal shield small, trapezoidal, broadest posteriorly; first vertebral with sinuous lateral borders, usually a little narrower in front than behind; second vertebral shortest, broader than long, usually with straight or slightly convex posterior border; third vertebral considerably longer than broad, subquadrangular, posterior border straight or slightly convex, fourth vertebral longest, tapering anteriorly and forming a narrow suture with the third; fifth vertebral much broader than the others. Plastron feebly angulated laterally, large; front lobe rounded, hind lobe angularly notched and as long as or a little shorter than the width of the bridge; the longest median suture is that between the abdominals, which about equals the length of the front lobe; gulars usually shorter than the suture between the humerals, their suture with the latter shields forming a right angle; inguinal large, axillary smaller. Head moderate; snout short, obtuse, feebly prominent; jaws with denticulated edge, upper not notched mesially; alveolar surface of upper jaw broad, the median ridge nearer the inner than the outer border; bony choanae between the orbits; the width of the lower jaw at the symphysis is less than the diameter of the orbit. Fore limbs with large transverse scales. Pale olive-brown above; dorsal keel usually blackish; plastral shields and lower surface of marginals dark brown, bordered with yellow. Length of shell 8.5 inches.