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into three principal geographical series with two subordinate groups all being biologically arranged. Thus we have the species of West America from the Arctic province to Cape Horn, the species of East America, and the general collection of exotic species. In the latter we have two subordinate divisions which are contained in one room with the East American series, but independently arranged. These are (1) the Jeffreys collection of North Atlantic, North European and British shells and (2) the collection of Arctic Marine shells from all parts of the Polar basin and adjacent waters. Among the Land shells of North America a