ight line across
the jaw, and the middle one is crowded backwards to a very slight
extent. The canine is peculiar and differs markedly from that of the
Raccoon. It is rather robust, very much recurved and grooved by a deep
vertical sulcus upon its antero-internal face. This sulcus is but
faintly indicated in the Raccoon. The postero-external face of the
crown is marked by a sharp ridge which becomes more prominent near the
apex. The first premolar is not preserved, but its alveolus indicates
that it was a single-rooted tooth, placed behind the canine after the
intervention of a very short diastema. The second premolar is
bifanged; its crown is composed of a principal cusp, to which is added
behind a small though very distinct second cusp. There is in addition
to these cusps a distinct basal cingulum, most prominent in the region
of the heel. The third premolar, like the second, is double rooted;
its crown moreover is made up of two cusps, the posterior being almost
as large as the principal one. These cusps do not stand in the line of
the long axis of the jaw, but are placed very obliquely to it. The
heel is not very prominent, but the basal cingulum is well developed,
both in front and behind. As compared with the Raccoon, the second
premolar is more complex in that it has two cusps instead of one. In
the third premolar the posterior cusp is much better developed, and
placed more obliquely than in the corresponding tooth of _Procyon_;
the heel is moreover not so broad.

The first molar is not preserved, but judging from the size of its
roots it was decidedly the longest tooth of the series. The second
molar was likewise bifanged but much smaller; it was placed close
against the base of the coronoid.

The whole jaw has, relatively, a greater depth than that of the
Raccoon, and is remarkably straight upon its lower border, whereas in
the recent genus it is considerably curved. The condyle is not
preserved, and the angle is somewhat damaged, but it was apparently
not so strongly inflected as in the Raccoon. The masseteric fossa is
deep and prominent, and the coronoid is high and broad. The inferior
dental canal is placed higher than it is in the Raccoon, being
slightly above the tooth line. The symphysis is relatively deeper and
more robust than in _Procyon_, and the chin is heavier and more
abruptly rounded.

The jaw of _Leptarctus_ differs from that of _Cercoleptes_ in the
following characters: the coronoid is broad