wide and truncated at the front. The bony nostrils are pointing to the front. In each nostril only a single nasal opening is visible, perhaps homologous to "Aperture A" in related species. Behind a narrow pair of nasal armour plates, rows of caputegulae stretch to the rear. The two front rows consists of pairs of rectangular plates. Part of the third row is a small central hexagonal caputegula. More to the back, the osteoderms all become square or hexagonal in profile and more strongly imbricating. Above the eye socket the front and rear supraorbitals form a sharp edge, protruding sideways. Deep in each eye socket, a bony plate is present. Similar plates in specimens of Euoplocephalus and Dyoplosaurus were reported by Walter Preston Coombs as bony eyelids. The squamosal horns on the rear corners of the skull roof are robust and pyramidal in shape. They have a sharp keel on top and deep grooves running towards the tip. The quadratojugal horns on the lower cheeks are also robust, with a convex front edge and a straight rear edge. They were seen as being mainly outgrowths of the quadratojugal bones themselves. The lower jaw is long and low. At its rear side, a large armour plate is present. According to Arbour and Evans, this is not a fused osteoderm, but instead an outgrowth of the jaw bones themselves. The adductor fossa, the opening through which the muscles closing the jaw entered its hollow inside, is relatively small and shallow. The dentary, the bone bearing the teeth, at the front curves sharply to the inside. This way both dentaries together had a profile fitting in the broad snout. The tooth row has a length of about . At the rear underside of the right lower jaw numerous ossicles, small bony scales, are visible. The largest of these are rectangular and up to high. They lie directly below the large armour plate. Even lower, rows of smaller hexagonal or diamond-shaped ossicles are positioned, of about in diameter, grouped in rosettes. The teeth are placed in tooth rows which together have a fluted profile. The tooth rows of the upper jaws bear about eighteen to twenty teeth. Those of the lower jaws bear twenty-eight teeth. The teeth are small, leaf-shaped and transversely flattened. The front teeth of the dentary have a base width, measured from the front to the rear, of about . Their