. The geography of mammals. cfragment, in which not only the genera, but frequently thespecies, are identical in both Regions. This portion of thefauna has probably reached the Nearctic Region by thepassage which must have existed in comparatively moderntimes across Behring Straits. Consequently, while theNeotropical element is the stronger in the south, this last,the Palrearctic element, is far more prevalent in theextreme north. 176 THE GEOGRAPHY OF MAMMALS List op the Principal Authorities referred toin Chapter VI. (1) Allem, J. A.—The Geographical Distribution of NorthAmerican Mammals. Bul
. The geography of mammals. cfragment, in which not only the genera, but frequently thespecies, are identical in both Regions. This portion of thefauna has probably reached the Nearctic Region by thepassage which must have existed in comparatively moderntimes across Behring Straits. Consequently, while theNeotropical element is the stronger in the south, this last,the Palrearctic element, is far more prevalent in theextreme north. 176 THE GEOGRAPHY OF MAMMALS List op the Principal Authorities referred toin Chapter VI. (1) Allem, J. A.—The Geographical Distribution of NorthAmerican Mammals. Bull. Amer. Mus. Nat. Hist., iv., p. 199. 1892. (2) Merriam, C. H.— The Geographical Distribution of Life inNorth America, with Special Reference to the Mammalia. Proc. Washington, vii., p. 1. 1892. (3) Zittel, Karl von.— The Geographical Development, Descent,and Distribution of the Mammalia. Geol. Mag., 3rd ser., x., p. (Translated from the S. B. k. Bayer. Akad. Wiss., xxiii., p. ). PLATE HE NEARCTIC REGION VISION INTO q ^ 176 THE GEOGRAPHY OF MAMMALS List of the Principal Authorities referred toin Chapter VI. (1) Allen, J. A.— The Geographical Distribution of NorthAmerican Mammals. Bull. Amer. Mus. Nat. Hist., iv., p. 199. 1892. (2) Merriam, C. H.— The Geographical Distribution of Life inNorth America, with Special Eeference to the Mammalia. Proc. Washington, vii., p. 1. 1892. (3) Zittel, Karl von.— The Geographical Development, Descent,and Distribution of the Mammalia. Gaol. Mag., 3rd ser., x., p. (Translated from the S. B. k. Bayer. Akad. Wiss., xxiii., p. ). PLATE VI.
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