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R. R. MILLER 



consider affinities of the freshwater fauna as a whole, emphasis is 

 placed on groups designated as primary (I) — made up of those fishes 

 that throughout their known history have, with rare exceptions, 

 been restricted to fresh water (Fig. 1). These comprise the great 

 continental faunas dominant on all land masses save Australia 

 (Darlington, 1957, Fig. 11); they fall principally into a single order 



NUMBERS OF 

 FAMILIES, GENERA 



AND SPECIES 

 OF NORTH AMERICAN 



PRIMARY 

 FRESHWATER FISHES 



w 



Fig. 1. Primary freshwater fishes of North America. For simplifica- 

 tion, the Lahontan Basin (labeled 2-7-8) is mapped too extensively, 

 including areas treated separately under Isolated Basin Drainages. See 

 text for discussion. See also Tables I-II. 



