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474 DENTAL ANATOMY.
dence upon which to base his belief than that afforded by the gradual
complication of the molar teeth from this point upward in the hoofed
Fig. 253.

Meniscotherium terrcerubrce, Parts of Cranium, Diree-fourths natural iize—fiom ^\ asatch Beds of New
Mexico: «, cranium from above; b, from below; r, portion ot upper jaw, displaying deciduous
molars (after Cope).
]\Iammalia, this alone, it appears to me, would be sufficient to gain for
it a respectful consideration at the hands of its opponents.
Fig. 254.

Lower Jaw ot M. terrcerubrx, three views (after ( ope).
The last family of this sub-order is the Memscothenidce, whose den-
tition is represented in Figs. 253, 254, The dental formula of the