Claorhynchus trihedrus Cope 1892

Claorhynchus trihedrus.—Gen. et. sp. nov. Char. Gen.—

This genus is established on a rostral and predentary bones of a species of the Agathaumidae, which were found together and with the fragments of a massive supratemporal bone. They are distinguished by their absolutely flat inferior faces, there being no alveolar ridges as in the forms described by Marsh. They are not compressed but are as wide as long. They are not adapted to the muzzle of Monoclonius, where the rostral bone is compressed. (M. sphenocerus.)

Char. specif.— Rostral and predentary bones as wide as long, with flat inferior face and rounded superior median angle. Transverse diameter rather exceeding the vertical. Sides convex. All the surfaces furrowed by coarse grooves which terminate in foramina.

The short wide form of this species differs from that seen in the species of the family Agathaumidae which have been yet described. The extremity of the beak had apparently a horny sheath and was adapted for crushing comparatively hard substances.