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TEETH OF THE VERTEBRA TA. 459

ond section the anterior and lateral faces of the mandible are separated
by an angle or vertical ridge, which gives to the jaw the appearance of
having a square chin.
The genera of this section, with the exception of ^liiror/ate, are from
the Miocene beds of the John
Fig. 238.
Day Valley, Oregon, and were
described by Cope ; the pre-
molar series shows a gradual re-
chiction in number, but they all
retain the heel to the inferior '^^'^S^i'^^^^
sectorial and the generalized Prmrhnn^ lal, m J illi, two-thirds natural size: «, inner
°
,, -. . view of niandilile />, superior view of inferior teeth;
,
character ot two true molars in r, mU-nor ^ectoiial, natural size (fioni Cope after
^'i''^"''-
thelowerjaw. ArcJudm'u.s and
Nhnravus are represented in the acconipanyii;g figures, 239 and 240.
Fig. 239.

Archfiehinis debilis, Cope, Skull, one-half natural size (after (ope).
Fig. 2J0.

Skull ot Nimravus gornjjhodnx. Cope, two-fifth-^ natural size Cafttr Copei: 1,2, first and second true
molars; .-,, 4, third and fourth premolars of lower jaw.