The frontal, which is located on the top of the skull between the premaxilla and the eye socket, takes the shape of a sub-rectangle with a large, rhombic process extending forward to meet the nasal. The frontal process of the premaxilla cuts into the frontal along the midline of this rhombus. Contacting the rear ends of both the frontal and jugal is the thin and triangular postorbital, about long along the bottom, extends backwards to separate the infratemporal and supratemporal fenestrae. The supratemporal fenestra itself is a somewhat four-sided oval. Behind the postorbital and closing off the supratemporal fenestra is the three-pronged squamosal, which is partially overlapped by the robust, spatula-like paroccipital processes of the occipital. Between the processes is the foramen magnum, which is a oval. Further below is the basoccipital, which forms a rounded plate that encloses the back of the skull.