Dawson, Phil. Trans. Roy. Soc. London, 1882, pt. II, p. 637, pl. 39, figs. 18-22.
Dawson, Proc. and Trans. Roy. Soc. Canada, 1895, p. 74.
Type: Specimen No. 3061-1, Peter Redpath Museum, McGill University. The British Museum ([393, pt. IV, p. 224]) also has a specimen, No. R 447.
Horizon and locality: Coal formation at the South Joggins, Nova Scotia.
Fragments of 3 specimens from 3 trees represent this species ([plate 10]). It seems to have been of stouter build than H. lyelli, with the limbs shorter in proportion. Its generic affinities are somewhat doubtful, as it presents in some respects characters intermediate between Hylonomus and Hylerpeton.
Mandibular and maxillary teeth broadly conical, about 20 in each mandible 3 in 1 mm.; anterior mandibular teeth somewhat larger than the others, and bent or hooked. Vomer or palate with minute teeth. Thoracic plate large. Scales of abdomen oval, but somewhat narrow, and tending to be oat-shaped.
| Length of mandible (imperfect) | mm. | 9 |
| Length of humerus | mm. | 7 |
| Length of vertebra | mm. | 2 |
| Length of tibia (?) | mm. | 5 |
| Length of thoracic plate | cm. | 1 |
| Length of six caudal vertebræ | mm. | 8 |
Hylonomus multidens Dawson.
Dawson, Phil. Trans. Roy. Soc. London, 1882, pt. H, p. 637, pl. 39, figs. 23-26.
Dawson, Proc. and Trans. Roy. Soc. Canada, 1895, p. 74