Geology . was the Coryphodon(Fig. 428). Near the middle of the period (Bridger epoch) the remark-able Dinoceras (terrible horn) appeared, followed later in the epoch byTinoceras, with which the line of the Amblypoda seems to have becomeextinct. The Dinocerata (Fig. 429) were grotesque monsters whoseskulls wTere armed with three pairs of protuberances perhaps horn cores,and a pair of enormous canine teeth or tusks projecting below, at leastin the male, an extravagant attempt at armature on both upper andnether sides, but with meager results, if the short history of their endur-ance is a true in
Geology . was the Coryphodon(Fig. 428). Near the middle of the period (Bridger epoch) the remark-able Dinoceras (terrible horn) appeared, followed later in the epoch byTinoceras, with which the line of the Amblypoda seems to have becomeextinct. The Dinocerata (Fig. 429) were grotesque monsters whoseskulls wTere armed with three pairs of protuberances perhaps horn cores,and a pair of enormous canine teeth or tusks projecting below, at leastin the male, an extravagant attempt at armature on both upper andnether sides, but with meager results, if the short history of their endur-ance is a true index. Their brains were smooth and singularly smallfor such ponderous bodies. All mammalian brains of the time werediminutive and simple, compared with later forms (see Fig. 430), but THE EOCENE PERIOD, 233 in the Dinoceras, brute-mass and low brain-power seem o have reachedtheir mammalian climax, much as they had reached a a earlier climaxin the monster reptiles. Nearly all dominant forms thereafter showed. Fig. 428.—One of the Amblypoda of the Lower Eocene (Wasatch) Coryphodonhama-tus, restoration of skeleton by Marsh. About TV natural size. For skull andbrain see Fig. 430a. From Wyoming. (After Marsh„) notable increase in the size and complexity of the brain, and from thistime on there was a gradual transition from the dominance of brute-force to the dominance of the brain-power.
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