M. Length of bony palate ·227 Length of head along the top ·743 Length of nasals ·398 Breadth at nasal tuberosities ·123 Distance between median projections ·385 Breadth of head posterior to median projections ·189 Breadth of head before posterior projections ·228 Breadth of head behind posterior projections ·312 Distance between extremities of posterior projections ·462 Length of nasals to ridge between median projections ·234 Length from ridge between median to ridge between posterior projections ·374 Length of zygomatic arch (straight) ·285 Length from angle of nares to end of nasals ·162 Length from angle of nares to end of premaxillaries ·114 Width between tips of premaxillaries ·053 Circumference of median projection at top ·203 Circumference of posterior projection at top ·329 Height of median projections from ridge between them ·174 Height of posterior projections from ridge between them ·239 Length of nasals anterior to nasal tuberosities ·0415 _Teeth._--These are peculiar for their small size compared with the bulk of the animal; for their slender fangs, and for the distance through which these are exposed. _Upper Jaw._--Formula: I. 0/0, C. 1/1, Pm. 3/3, M. 3/3. _Canines._--The sockets of these teeth have been already described: the fangs are very long, somewhat longer than the crown, and the teeth apparently grew from permanent pulps. The crown is long, compressed and recurved; the posterior margin is sharp, and exhibits some indications of a slight serration. _Premolars._--The first premolar is not preserved in our specimen. The second and third are subequal, and of about the same conformation. They are implanted by three fangs, one internal and two external. The crown is subcircular at the base. The basal ridge is large, and completely surrounds the crown; above this the crown becomes somewhat trihedral: and is composed of two pyramidal lobes, which meet internally and externally, and are divided by a valley. The summits of the lobes form transverse grinding ridges; the anterior one is the lower, and is crescent-shaped, while the posterior is straight; the anterior ridges throughout the series are much the most worn. The basal ridge is not indented on the outer side at the opening of the valley as in _Dinoceras_.