on: FIG. 5. _Hesperoherpeton garnettense_ Peabody, KU 10295,
x 4. A, occipital view of skull; B, basioccipital bone in dorsal
(internal) view.]

The otic capsules appear to have rested against lateral projections of
the basioccipital. The single otic capsule that can be seen (the
right) is massively built, apparently ossified in one piece, with a
shallow dorsomedial excavation, probably the vestige of a supratemporal
fossa. On the lateral face is a broad, shallow depression dorsally, and
a narrower, deeper one anteroventrally; these we suppose to have
received the broader and narrower heads of the stapes, respectively.
The posterior wall of the otic capsule we have designated opisthotic in
the figure. Anterior to the otic capsule the lateral wall of the
braincase cannot be seen, and may not have been ossified.

The roof of the braincase is visible in its ventral aspect, extending
from approximately the occipital margin to a broken edge in front of
the parietal foramen, and laterally to paired processes which overlie
the otic capsules directly behind the orbits (see dotted outlines in
Fig. 1). Each of these postorbital processes, seen from beneath,
appears to be the lateral extension of a shallow groove beginning near
the midline. Presumably this section of the roof is an ossification of
the synotic tectum. It should be noted that the roof of the braincase
proper is perfectly distinct from the overlying series of dermal bones,
and that the parietal foramen can be seen in both. The roof of the
braincase in our specimen seems to have been detached from the
underlying otic capsules and the occipital wall.

The bone that we take to be the stapes is blunt, flattened (perhaps by
crushing), 5.0 mm. in length, and has two unequal heads; its width
across both of these is 4.0 mm. The length is appropriate to fit
between the lateral face of the otic capsule and the dorsal edge of the
quadrate; the wider head rests on a posterodorsal concavity on the otic
capsule, and the smaller fits a lower, more anterior pit. Laterally the
stapes carries a short, broad process that probably made contact with a
dorsally placed tympanic membrane. Thus the bone was a hyomandibular in
the sense that it articulated with the quadrate, but it may also have
served as a stapes in sound-transmission. It contains no visible canal
or foramen.

_Mandible_ (Fig. 6)

The crushed inner surface of the posterior part of the left mandible
and most of the exte