er and of less vertical
extent; the condyle is not placed so high; the angle is elevated above
the lower border of the ramus, which is straight and not concave as it
is in _Cercoleptes_. In the depth of the symphysis and abrupt rounding
of the chin the two genera are similar. _Cercoleptes_, moreover, has a
moderately deep groove upon the antero-internal face of the canine,
but differs from that of _Leptarctus_ in having an external groove as
well. _Cercoleptes_ again resembles _Leptarctus_ in having only three
premolars in the lower jaw; the middle one, however, has only a single
cusp upon the crown, whereas _Leptarctus_ has two.

As compared with _Bassaricyon_,[2] the jaw is more robust, shorter and
deeper, with a more prominent chin. The two genera differ again in the
number of premolars.

Altogether, _Leptarctus_ appears to offer a number of transitional
characters between the more typical Procyonidae and the aberrant
_Cercoleptes_. This is especially to be seen in the proportions of the
jaw, the reduction of the number of premolars, the reduction in size
of the last molar, as well as the depth of the mandibular symphysis.

FOOTNOTES:

[1] Extinct Fauna of Dakota.

[2] See J. A. Allen's paper, Proc. Phil. Acad., 1876, p. 21.

Transcriber's Note:

"Quartenary" was amended to "Quaternary" in the first paragraph.

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of Leidy, by J. L. Wortman

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