erior end. The height diminishes anteriorly
to about 1.5 mm. at the premaxillary. The length is about 15.5 mm. in
the median line, or 24.0 mm. to the tip of the tabular, and the width
about 16.0 mm. posteriorly. The snout is blunt, continuing about 1-2
mm. anterior to the external nares. Each of the tabulars has a slender
posterior process 5.0 mm. long, which probably met the supracleithrum;
the intertabular space is about 8.5 mm. wide. The orbits are
approximately 5.5 mm. in diameter and extend from the maxillary to
within about 3.0 mm. of the midline dorsally. The pineal opening is 1.8
mm. anterior to the occipital margin of the skull.

Reduction of bones at the back of the skull seems to have eliminated
any dermal elements posterior to the squamosal, while enlargement of
the orbit has removed most of the postorbital series, leaving the
squamosal as the only cheekbone. There is apparently no jugal or
postfrontal.

The squamosal of _Acanthostega_ (Jarvik, 1952) is articulated under the
tabular and reaches forward and down, much as if it were an opercular
in reversed position. Internally, it must lie against the otic capsule
below the tabular, partially concealing the stapes. The bone that we
suppose to be the squamosal of _H. garnettense_ is of similar shape, of
about the same size and has internally an articular surface at one
corner, bounded by a pair of ridges in the shape of a V. This articular
surface probably fitted on a lateral process extending from the roof of
the neurocranium, over the front of the otic capsule.

The premaxillary extends posterolaterally to a distance 5.5 mm. from
the midline and attains a width at its broadest point of about 1.5 mm.
The posterior edge is slightly concave and in part forms the anterior
border of the naris.

[Illustration: FIG. 1. _Hesperoherpeton garnettense_ Peabody. Skull,
dorsal view. Postorbital processes of the neurocranium are shown in
dotted outline. KU 10295, x 4.]

The nasal is triangular and, with the lacrimal, forms the medial border
of the naris. The length of the medial side of the nasal bone is
approximately 5.0 mm., the transverse width is 3.8 mm., and the extent
of the posterolateral border is 5.5 mm.

The maxillary meets the premaxillary lateral to the naris, borders the
naris posteroventrally, and continues posteriorly beneath the orbit, of
which it forms the external border. The maxillary is about 8.5 mm.
long, and immediately anterior to the orbit h