Freshwater Fish Zoogeography 27 
Fig. 1. Major drainages of southern Atlantic and eastern Gulf slopes, includ- 
ing peninsular Florida. Fall Line indicated by heavy dashed line extending diag- 
onally across middle Alabama, Georgia and South Carolina. From Swift et al. 
(1986). 
constitute the smallest total for any of the faunal complexes (Fig. 2) 
between the Savannah and Mississippi rivers (Swift et al. 1986), and this 
is particularly significant when one considers the relatively large geo- 
graphical area involved. Only 50 of the 72 species are primary-division 
freshwater fishes, as defined by Myers (1938), and thus are essentially 
intolerant of salt water. The remaining 22 species, which belong to 
