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4. INDICATE BRIEFLY THE PRESENT CONDITION OF THE EXHIBITION SERIES AND THE STUDY SERIES, IN YOUR DEPARTMENT.

The collection of recent and tertiary mollusks are in the Smithsonian Institution and are disposed as follows: -

"The general marine collection occupies the drawers of the cases running along the middle of the main hall; the collection from the west coast of North and South America and the general collection of land and fresh-water shells are in the south-eastern gallery; the Jeffreys collection and the collections from the West Indies and east coast of North America are in Dr. Dall's offices in the north tower. The Lea collection of Naiads is exhibited in the table cases in the eastern half of the main hall; the tree-snails from the Philippine Islands are exhibited in two table cases in the western half of the main hall. The duplicates are stored in the basement.

The alcoholic collection occupies the basement room, part of the north-eastern gallery and two rooms in the north tower.

The collection of tertiary fossils is in the north-eastern gallery.

The collection of shells from the West Indies and the south-eastern coast of North America, and the collection of Mactridæ have been arranged in permanent form by Dr. Dall; and the general collection of Naiads and the tree-snails of the Philippine Islands have been arranged by Mr. Simpson; but the general collection is only temporarily arranged. The permanent arrangement will progress as the study of the various groups is completed."