. Annual report of the Board of Regents of the Smithsonian Institution . ^ a proboscidian thoughformerly classed with the Sirenia. This form is Dinotherium^ andmust have been derived from some very early genus, certainly notlater than Palceomastodon. The teeth differ from those of the ele-phants in their greater number and in their mode of succession, being. Fig. 25.—Jaw of Dionotherium ;after Kaup. EVOLUTION OF THE ELEPHANT LULL. 665 more like those of other mammals. The grinding teeth are extremely-simple, the premolars having 3 while the molars have but 2cross crests with open, luicemented
. Annual report of the Board of Regents of the Smithsonian Institution . ^ a proboscidian thoughformerly classed with the Sirenia. This form is Dinotherium^ andmust have been derived from some very early genus, certainly notlater than Palceomastodon. The teeth differ from those of the ele-phants in their greater number and in their mode of succession, being. Fig. 25.—Jaw of Dionotherium ;after Kaup. EVOLUTION OF THE ELEPHANT LULL. 665 more like those of other mammals. The grinding teeth are extremely-simple, the premolars having 3 while the molars have but 2cross crests with open, luicemented valleys. Tusks are apparentlyconfined to the lower jaw, no trace of ujDper tusks having been seenin the only known skull, now unfortunately lost. Those of the lowerjaw were large and, together with the elongated symphysis, bentabruptly downward, the tips being actually recurved. The skeleton,so far as known, indicates a huge elephant-like body and limbs andthe impression is that the creature must have been semiaquatic, fre-quenting the beds of streams and living upon the succulent herbagewhich it rooted up by means of its tusks. The contour of the skull isill known, so that, with the exception of the lower jaw, restorationsof the head are largely conjectural. Dlnotherium died out in thePliocene, leaving no descendants. Part III. MIGRATIONS OF THE P
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