posterior extremity of the
cheek. It outlines almost entirely the posterior border of the orbit,
the ventrolateral portion of the cheek region, and the lateral border
of the top of the skull behind the orbit. Dorsally, the squamosal meets
the anterior half of the tabular and the lateral border of the
supratemporal. Near the anteroventral edge of the squamosal there is a
small pit, probably related to a postorbital sensory pore in the skin.

The tabular (Fig. 3 C, D) is pointed anteriorly, where it probably fits
against the lateroposterior edge of the postorbital. The dorsal part of
the bone flares out and down, forming a small otic notch at a point
halfway back. Posteriorly, the flange attains a dorsoventral width of
2.0 mm. at the edge of the notch. The slender posterior process of the
tabular which continues beyond the flange is approximately 0.5 mm. in
diameter and 5.0 mm. long.

_Ventral Aspect_ (Fig. 4)

The palatal view of the skull shows the paired premaxillary, maxillary,
palatine, pterygoid, and quadrate bones. The openings for the internal
nares, the ventral orbital fenestrae, and the subtemporal fossae are
readily recognized. The quadrate processes extend posteriorly leaving a
large gap medially at the posterior end of the skull.

[Illustration: FIG. 4. _Hesperoherpeton garnettense_ Peabody. Palate
reconstructed; ventral aspect at left, showing teeth, dorsal aspect at
right. KU 10295, x 4.]

The left quadrate appears to be in place on the posterior prong of the
pterygoid. The dorsal side of the quadrate is grooved between two
anterolaterally directed ridges. The groove, which probably held the
end of the stapes, extends about half the width of the quadrate itself.
The width of the quadrate is 4.0 mm., the length is 4.5 mm. medially
and about 2.0 mm. laterally. In ventral view the quadrate appears to
project laterally, but is incomplete and its shape uncertain. The
distance from the posterior end of the quadrate to the visible
posterior edge of the orbital fenestra, which opens ventrally, is 10.0
mm.

This region between the quadrate and the orbit is occupied by a
pterygoid with three projections. Anteriorly, the pterygoid outlines
most of the posterior edge of the orbit (a distance of about 6.5 mm.).
A lateral process separates the orbit from the subtemporal fossa. A
posteriorly directed edge defines the fossa, which extends about 6.5
mm. anteroposteriorly. The lateral process of the pterygoid terminat