Boyer diss 2009 1046..

average, than P. rex. Repositioning cropped scan images of teeth allows an estimate of
the length of the tooth row from P 2 to M 3 at 13.47 mm.
Frontal contact by the maxilla occurs between the premaxilla and lacrimal on the
dorsum of the skull, measuring 3.77 mm in length on the left side (Fig. 2.1: 10). Palatine
contact (tranverse palatine suture) occurring on the palate is not visible (Fig. 2.2).
Because the palate is visible anterior to P 4 , it can be inferred that the palatine was
restricted to a point posterior to this. It can also be inferred that the zygomatic process of
the maxilla arose posterior to P 4 . The presence of a mediolateral expansion on the ventral
surface of the zygomatic bone (for attachment of the masseter muscle) suggests that the
zygomatic process of the maxilla would have expressed a similar expansion (Fig. 2.1: 9).
The unilateral breadth of the palatal part of the right maxilla just posterior to I 2 is 3.39
mm. At the anterior margin of P 2 it measures 5.45 mm. These measurements thus reveal
an anteriorly tapering snout. The infraorbital canal length cannot be determined due to
crushing of the maxilla’s posterior end, but the diameters of the left infraorbital foramen
are measurable at 2.12 mm and 1.26 mm. The infraorbital foramen is situated above P 2-3
(Figs. 2.2, 3: 11).
Zygomatic.—As indicated above, a fragment of the right zygomatic is preserved
(Fig. 2.1). None of the sutures are preserved (for the maxilla, lacrimal and squamosal).
The maximum dorsoventral depth of the element is roughly 4 mm. The mediolateral
expansion of the ventral surface of the zygomatic bone (for attachment of the masseter
muscle) measures 1.29 mm (Fig. 2.1: 9).
Frontal.—The frontals are visible on the dorsum of the skull; in this region the
frontals contact the maxillae, nasals, and lacrimal (Fig. 2.1). Breakage makes the
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