58 THE KEILOR FOSSIL SKULL: ANATOMICAL DESCRIPTION 
made according to the biometric technique of Buxton and Morant 
(3). Those used by Morant (6) were calculated from measure- 
ments made by other authors. The symbols in the table are 
those used by Morant and other authors of papers published in 
Biometrika, with two additional symbols, Z:, Zz. Wunderly’s (11) 
figures for the orbital breadth of the Tasmanians apply to the 
dacryal orbital breadth. 
The inferior border of each nasal bone is missing. The maximum 
width of the nasal bones, measured at their existing lower borders, 
is 165 mm. Their width at the fronto-nasal suture is 19 mm. As 
the lateral margins of the pyriform aperture exhibit the positions 
to which the nasal bones originally extended, their maximum width 
has been measured on these margins; it is 20 mm. 
All linear measurements are in millimetres. 
ANATOMICAL CHARACTERISTICS 
The skull is long, but it is not high or wide relative to its length. 
The surface of the bone is generally smooth. The areas of muscle 
attachment are not as rough as in many Australian skulls. 
The median curvature of the frontal bone is as broad as that 
found in the majority of the skulls of Australian and Tasmanian 
males. The superciliary and supra-orbital ridges are moderately 
prominent, but the nasion is not deeply depressed. 
The parietal eminences are not as prominent as they are in many 
Tasmanian skulls, but they are more noticeable than in the 
majority of Australian crania. The Keilor skull exhibits occipital 
protuberance to an extent that is unusual in the skulls of males 
of the Oceanic races, except the Tasmanian. 
The cranial sutures are not complicated. The metopic suture is 
patent throughout almost its whole length. Parts of the coronal 
and the metopic sutures are fused outwardly. The posterior one- 
third of the sagittal suture lies in a slight depression. 
The orbits are distinctly rectangular and their transverse axes 
are inclined upwards at their median ends more than in some 
Tasmanian, but less than in the majority of Australian skulls. In 
the upper margin of the right orbit there is a notch about 3 mm. 
is and in that of the left orbit a shallow groove about 5 mm. 
wide. 
The margins of the narial aperture are not so broadly rounded 
as in many Tasmanian and Australian skulls. On the right the 
inferior margin is single and well defined, while on the left it is 
double and it has fairly sharp edges. The nasal bones are typically 
Australian, and they lack the extreme restriction and convexity 
seen in many Tasmanian specimens. 
