Cranial measurements were taken as follows:
Basilar length.—From the anteriormost inferior border of the foramen magnum to a line connecting the posteriormost margins of the alveoli of the first upper incisors.
Length of the nasals.—The greatest length of the nasals.
Zygomatic breadth.—The greatest distance across the zygomatic arches.
Mastoid breadth.—The greatest distance across the mastoids.
Breadth of rostrum.—Width, perpendicular to long axis of the skull.
Interorbital constriction.—The least distance between the orbits.
Maxillary tooth row.—The greatest length of the upper molariform tooth row at the alveolar border.
Extension of premaxillae posterior to nasals.—From the posteriormost border of the nasals to the posterior end of the extension of a premaxilla.
Depth of skull.—From the median suture of the frontals, on the dorsal surface of the skull to the median suture of the palatines at the level of the first molar (not premolar).