New genera and species from the Belly River Series (mid-Cretaceous) Author Lambe L. M. text Geological Survey of Canada Contributions to Canadian Palaeontology 1902 3 25 81 journal article 10.5281/zenodo.3233762 1fa3e048-6e17-4084-926c-3c77dabfffc9 3233762 Boreodon matutinus . Sp. nov. Plate XV., fig. 15 . This early type of mammal is represented by a single tooth, a premolar, having two, slightly divergent roots. The crown is in the form of a laterally compressed cone, somewhat rounded above, angular in front, evenly rounded behind, with a well defined, undulating cingulum encircling its base. A slight lateral concavity, more clearly defined within, occurs in each side of the tooth near the base of the crown in line with the cleft between the roots. The cingulum is angular and pl'ominent at either end, becoming rounded and broader on the sides. The crown is considerably worn on the inner side of its apex. One root only remains and it is imperfect below.