Freshwater Fish Zoogeography 
41 
Fig. 6. Distribution of Cyprinodon variegatus in Florida, in relation to Pleis- 
tocene Pamlico shoreline (8-10 m above present mean sea level). Dots denote 
collection localities for C. v. variegatus ; stars denote localities for C. v. hubbsi. 
Modified from Johnson (1974). 
the St. Johns drainage, but in contrast to the situation just described 
they still occur in parts of the Suwannee drainage (Bohlke and Rohde 
1980c, Cashner 1980, Gilbert 1980a). 
INFLUENCE OF CODY SCARP ON FISH DISTRIBUTIONS 
All but the shortest rivers of northern Florida drain two physio- 
graphic areas, the Northern Highlands and the Coastal Lowlands (Puri and 
Vernon 1964, White 1970). The section of the Northern Highlands east 
of the Apalachicola River valley is called the Tallahassee Hills (Puri and 
