in Larus, it extends far enough to help to bound the foramen magnum.
fm, Foramen magnum.
fin, Foramen magnum.
The basal line of the cranium from the lower border of the foramen magnum to the incisor border of the palate is nearly straight.
It is therefore very probable that the authors quoted in (2) were mistaken in their identification of the elements at the base of the foramen magnum.