30 C. C. Bentley, J. L. Knight, and M. A. Knoll 



We also wish to recognize all those who toiled along with us in 

 the field: Vance McCollum, Linda Eberle, Craig and Alice Healy, 

 Derwin Hudson, Ray Ogilvie, Lee Hudson, Tom Reeves, Suzanne 

 Boehme, George Beighley, Jr., Martha Bentley, and Karin Knight. 

 We are grateful to David Webb and Gary Morgan of the Florida 

 Museum of Natural History, for allowing us access to the UF collec- 

 tion and critical reviews of this manuscript. We also wish to thank 

 Gary Morgan for his aid in the identification of ambiguous species. 

 Robert Martin kindly provided us with his unpublished manuscript, 

 helped us with initial identification of the microtines, and discussed 

 muskrat evolution. We also wish to express our appreciation to Mike 

 Trinkley and Debi Hacker of the Chicora Foundation, Columbia, South 

 Carolina, for the frequent use of their field equipment; Michael Runyon, 

 Lander University, for donating mammoth bone samples for dating 

 purposes; Claudia Angle, United States Fish and Wildlife Service; 

 and Bob Purdy and Clayton Ray of the National Museum of Natural 

 History for their courtesies extended. Wallace Dawson and Fontelle 

 Thompson of the University of South Carolina reviewed an earlier 

 draft of this paper. Finally, thanks go to Overton Ganong, Director of 

 the South Carolina State Museum, and Darby Erd for the superb illus- 

 trations. 



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