Dawson, Acadian Geology, 3d ed., p. 376.
Type: Specimen No. 3061-3, Peter Redpath Museum, McGill University. The British Museum ([393, pt. IV, p. 224]) also has a specimen, No. R 433.
The important characteristic ([plate 12]) is found in the form of the mandibular and maxillary teeth, which are of a peculiar wedge-shape, being broad and oval at the base and narrowed to a longitudinal edge at top. Thus, when viewed from the side they appear narrow and blunt, but when the jaw is broken across, and they are viewed from the rear or front, they appear broad and sharp-edged. The effect of this arrangement is that the jaw is armed with a closely placed series of chisels or wedges, giving an almost continuous edge. At the end of the mandible some of the teeth are longer and more conical.
Another important character is that the palatal and vomerine bones seem to have bristled with teeth, mostly of very small size; but there are also some larger palatal teeth, of which some are sharply pointed and others blunt with furrowed points.
The vertebræ are of the same type as those of Hylonomus; but some which appear to be caudal have a pointed spine above, indicating perhaps a flattened tail. The ribs are short and stout.
The body seems to have possessed an interclavicle and ventral scutellæ. Above it was, apparently, clothed with small tubercles and horny scales, and to have had cuticular pendants like those of Dendrerpeton.
An additional species of this genus was apparently indicated by some fragmentary remains, but Dawson thought best not to describe them as such, since they might indicate only a young individual of the present species.
| Length of mandible | 1.5 | cm. |
| Length of femur | 1.5 | cm. |
| Length of humerus (?) | 1.3 | cm. |
| Length of vertebra | 3-5 | mm. |
| Length of rib | 1 | cm. |
| There are 5 teeth in 2 mm. |