1. Science and Mathematics Division, Eastern Oklahoma State College, Idabel, Oklahoma 74745.
2. P. O. Box 197, Burdett, Kansas 67523.
3. La Crosse Fish Health Center—Midwest Fisheries Center, U.S. Fish and Wildlife Service, Onalaska, Wisconsin 54650.
4. Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30677.
5. Department of Biological Sciences, Arkansas State University (Emeritus), State University, Arkansas 72467.
6. Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi 39762.
7. 602 Big Creek Drive, Sherwood, Arkansas 72120.