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Contents: Joseph Leidy and the “Great Inventory of Nature,” by Susan Glassman, Eugene A. Bolt, Jr., and Earle E. Spamer; The Joseph Leidy Medal; Mollusca of the Grand Canyon and Vicinity, Arizona: New and Revised Data on Diversity and Distributions, with Notes on Pleistocene-Holocene Mollusks of the Grand Canyon, by Earle E. Spamer and Arthur E. Bogan; Bibliography on the Fine-Structure of Diatom Frustules (Bacillariophyceae), by Ursula Gaul, Ursula Geissler, Margaret Henderson, Ronald Mahoney, and Charles W. Reimer; Wetland Plants: Diversity, Function and Importance -- A Symposium: Introduction, by Alfred E. Schuyler; Using Plants as Indicators of Wetland, by Ralph W. Tiner; Rare Wetland Plants and Their Habitats in Pennsylvania, by Anthony F. Davis; Plant Zonation Changes in the Tidal Portion of the Delaware River, by Alfred E. Schuyler, Sarah B. Andersen, and Valerie J. Kolaga; Seeds and Seedlings of the Hamilton Marshes, A Delaware River Tidal Freshwater Wetland, by Mary A. Leck and Robert L. Simpson; Pollution Filtration by Plants in Wetland-Littoral Zones, by Ann M. Mickle; Effects of Streamside Vegetation on Macroinvertebrate Communities of White Clay Creek in Eastern North America, by Bernard W. Sweeney. Illus.
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