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With it occurs also an extinct form of Hippopotamus, called Hexaprotodon, and a species of Hippotherium and pig, also two species of Mastodon, two of elephant, and three other elephantine proboscidians; none of them agreeing with any fossil forms of Europe, and being intermediate between the genera Elephas and Mastodon, constituting the sub-genus Stegodon of Falconer.
Two of these species, however, he has always considered as doubtful, Stegodon ganesa, probably a mere variety of one of the others, and Elephas priscus of Goldfuss, founded partly on specimens of the African elephant, assumed by mistake to be fossil, and partly on some aberrant forms of E. antiquus.
Evidently these various avenues may have given access to immigrants from Siberia, from China, from Malaysia, and from Polynesia. *There have been found in the gravel Tertiary mammals including elephas primigenius, elephas Namadicus, stegodon Clifti, and unnamed varieties of bear, deer, bison, ox, horse, rhinoceros, and whale.
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