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Document Type

Research

Abstract

Few American mollusks equal Helicina occulta Say in interest. It is an operculate species which has been reported at times as aquatic, though it is strictly terrestrial; its living representatives are distributed over widely separated areas in restricted local colonies, and evidently represent a declining race; and it is a common fossil of the loess of peculiar significance, of much more general distribution in the loess-covered portions of the upper Mississippi- Missouri basin, failing to reach the region of the northernmost living colonies, but extending well beyond them westward.

Publication Date

1919

Journal Title

Proceedings of the Iowa Academy of Science

Volume

26

Issue

1

First Page

385

Last Page

390

Copyright

©1919 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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