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6 

this report therefore is practically a report on the Department of Tertiary Invertebrate fossils as well as of the Department of Mollusks.

A biological arrangement has been adopted in arranging the fossils, the distinctions of supposed age being retained only on the labels. The result of this is to bring together all the species of any one genus from the Eocene to the Post Pliocene, and, in the writer's opinion, a study of the collection thus arranged is likely to reduce by two-thirds the number of nominal species now on our lists of Tertiary fossils of the United States.

The general collection is divided