1. Research professor in the Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755.
2. Associate professor at the College of Marine Studies, University of Delaware, Newark 19711.
3. Director of administration at Harvard University Herbaria, Harvard University, Cambridge, Massachusetts 02138.
4. Director of Chesapeake Research Consortium, Shady Side, Maryland 20764.
5. Assistant professor at the College of Marine Studies, University of Delaware, Newark.
6. Associate professor at Chesapeake Biological Laboratories, University of Maryland, Solomons 20688.