rnal surface of the right mandible are preserved in
close proximity. Although the whole length of the tooth-bearing margins
is missing, some parts of six elements of the right mandible can be
seen. The pattern of sutures and the general contour closely resemble
those of _Megalichthys_ (Watson, 1926, Figs. 37, 38) and other known
Rhipidistia.

The anteroposterior length of the mandible is about 23.8 mm., and the
depth is 3.8 mm. The dentary extends approximately 17.6 mm. back from
the symphysis, and its greatest width is probably 2.0 mm. Its lower
edge meets all the other lateral bones of the jaw. The splenial and
postsplenial form the curved anteroventral half of the jaw for a
distance of about 9.0 mm. The fragmented articular, on the posterior
end of the jaw, is 4.0 mm. long and 2.0 mm. deep, exhibiting a broken
upper edge; presumably the surface for articulation with the quadrate
was a shallow concavity, above the end of the articular.

[Illustration: FIG. 6. _Hesperoherpeton garnettense_ Peabody. Right
mandible, lateral view, KU 10295, x 4. External surfaces are pitted;
broken surfaces are coarsely stippled.]

VERTEBRAE (Fig. 7)

The vertebrae that are visible from a lateral view are crushed and
difficult to interpret. It is possible, nevertheless, to see that the
trunk vertebrae resemble those of Ichthyostegalia (Jarvik, 1952, Fig.
13 A, B), except that the pleurocentra are much larger. A few parts of
additional vertebrae can be seen, but they are so scattered that it is
impossible to be sure of their original location. Therefore comparisons
between different regions cannot yet be made.

The U-shaped intercentrum encloses the notochord and occupies an
anteroventral position in the vertebra. Anteriorly, each intercentrum
articulates with the pleurocentra of the next preceding vertebra by
slightly concave surfaces. Dorsolaterally there is an articular surface
for the capitulum of the rib.

The two pleurocentra of each vertebra are separate ventrally as well as
dorsally, but form thin, broad plates of about the same height as the
notochord. The lateral surface appears to be depressed, allowing,
perhaps, for movement of the rib. Above each pleurocentrum, on the
lateral surface of the neural arch, there is a short diapophysis for
articulation with the tuberculum of the rib.

The margin of the neural spine is convex anteriorly and concave
posteriorly, the tip reaching a point vertically above the
postzygapophys