sentences:  Each side of the skull has three Eustachian foramina present - two on each basioccipital, one anterior and one posterior, and one between basisphenoid and otoccipital in the basal tuber.A pair of crests runs between the quadrate and the pterygoid on each lateral side of the braincase.The lower jaw is U-shaped, to match the upper jaw; the dentary bears twenty-one teeth on each side.