Dr John T. Tanacredi is Chief, Division of Natural Resources for the National Park Service at Gateway National Recreation Area. He is a Research Associate in the Department of Invertebrate Zoology at the American Museum of Natural History and at the Aquarium for Wildlife Conservation. He holds Adjunct Full Professor of Environmental Sciences at Hofstra University and Polytechnic University.

• Introduction: Limulus in the Limelight.- Local Species with Global Implications.- Horseshoe Crabs Imperiled?.- Biology and Evolution.- Two Perspectives: Horseshoe Crabs During 420 Million Years, Worldwide, and the Past 150 Years in the Delaware Bay Area.- The Conservation of Horseshoe Crabs: What Can We Learn From the Japanese Experience?.- A Unique Medial Product (LAL) from the Horseshoe Crab and Monitoring the Delaware Bay Horseshoe Crab Population.- Behavior and Diversity Studies.- Tracks and Trails.- Biomedical Products from the Horseshoe Crab: Lessons for Sound Resource Mangement and Conservation.- Issues and Approaches in Regulation of the Horseshoe Crab Fishery.- The Life History of Horseshoe Crabs.- Horseshoe Crab Mangement and Resource Monitoring in New Jersey 1993–1998.- Present Day Investigations.- Horseshoe Crab Surveys Using Underwater Videography.- Horseshoe Crabs: An Ancient Wonder of New York and a Great Topic for Environmental Education.- Living on Limulus.- An Estimate of Population Sizes of Two Horseshoe Crab (Limulus polyphemus) Sites in Jamaica Bay.- A Final Word.- Preserving a Living Fossil.