the midline. Posterior to the extra

the midline. Posterior to the extrascapulars there is
a single pair of large posttemporal bones. Frontals,
parietals, dermopterotics, extrascapulars, and
posttemporals are ornamented with densely and
irregularly arranged tubercles.
The supraorbital sensory canal runs from the
nasals posteriorly almost straight and parallel to
the inter-frontal suture, and ends in the anterior
portion of the parietal (Figure 7, Figure 9). The temporal
canal runs through the latero-ventral margins
of the posttemporal, extrascapular and dermopterotic
bones and turns upwards rather
abruptly at the anterior margin of the dermopterotic
to meet the infraorbital canal in the dermosphenotic
bone. The extrascapular bones are further
traversed by the supratemporal commissure.
Circumborbital bones. Three slender sclerotic
bones are preserved in MPEF-PV 3958 (Figure 9),
but the total number was probably four. Starting at
the ethmoidal commissure, the infraorbital sensory
canal is contained in the antorbital, five infraorbital
bones and the dermosphenotic. The antorbital
bone, which is best preserved in MPEF-PV 3958
and 10504, is Y-shaped and carries the junction
between the ethmoidal commissure and the supraorbital
and infraorbital canals (Figures 7, Figure 8,
Figure 9). The first infraorbital bone is small and
subrectangular, longer than deep, and is located at
the anteroventral corner of the orbit. Two other
infraorbitals form the ventral margin of the orbit,
these two infraorbitals are longitudinally elongated,
the first of them being short, a little longer than
deep, but the second is long and a little deeper