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27

printed may be summarized as follows:

The Curator has devoted a large proportion of his rather scanty leisure to the examination and illustration of the Tertiary fauna of Florida, especially that above the Eocene. [?]  The first half of the resulting monograph is now passing through the press.

The second part is fairly well advanced, and will require the writer's attention for some time to come.

In connection with this investigation the writer has studied and offers an explanation of the dynamic process by which the spiral parallel ridges of the interior of gastropod shells are produced and become amenable to the influence of Natural Selection.  As one of the first demonstrations of dynamical evolutionary processes among Mollusks this paper, it is believed, will have its interest.

Dr. Stearns has been at work on the