Fig. 18. Skeletal elements of Smilerpeton aciedentatum Dawson, from the Coal Measures of Nova Scotia. (After Dawson.) a, shaft of femur, × 2; b, intermaxillary and teeth, × 25; c, sections of teeth, × 25; d and e, palatal teeth, × 25; f, femur, × 2; g, rib, × 2; h, palate; i, caudal vertebræ; j, long palatal tooth, × 25; k, bony scale.

Genus HYLERPETON Owen.

Owen, Quart. Jour. Geol. Soc. London, XVIII, p. 241, 1862.

Dawson, Amer. Jour. Sci. (3), XII, p. 443, 1876.

Dawson, Phil. Trans. Roy. Soc. London, 1882, pt. II, p. 634.

Dawson, Proc. and Trans. Roy. Soc. Canada, 1895, p. 74.

Dawson, Air-breathers of the Coal Period, p. 55, pl. vi, figs. 32-46, 1863.

Body stout, with strong limbs. Mandibular and maxillary teeth strong, not numerous, grooved at apex. Palatal teeth numerous, and some of them large. Thoracic plate broad. Abdominal scales pointed or oat-shaped.

Type: Hylerpeton dawsoni Owen.