124 J. E. Cooper and A. L. Braswell 



Roanoke River — The Roanoke is another heavily impounded 

 river. Its major western tributary, the Dan River, begins in the Blue 

 Ridge in Virginia, and in northeastern Surry, Stokes, and Forsyth 

 counties, North Carolina. The Dan flows essentially east and north, 

 moving in and out of North Carolina in northern Rockingham and 

 Caswell counties, and acquiring tributaries in both. It joins the 

 Roanoke at Buggs Island Reservoir in Virginia. The Roanoke then 

 flows southeast into North Carolina, adding tributaries in northern 

 Granville and Vance counties and feeding into John H. Kerr Reservoir 

 and Lake Gaston. The river flows southeast from Lake Gaston, drains 

 southwestern Northampton, northern Halifax, and most of Bertie and 

 Martin counties, then empties into the western arm of Albemarle 

 Sound at Batchelor Bay. 



Cambarus longulus and C. b. bartonii occur in the upper Dan 

 River watershed, where C. longulus is known from no farther east 

 than Rockingham County, and the eastern limits of the range of C. b. 

 bartonii are unknown. Cambarus sp. C apparently occurs throughout 

 the system. Cambarus diogenes and F. fodiens occur in the Coastal 

 Plain, but encroach on the Piedmont Plateau, where the western limits 

 of their ranges are uncertain. Procambarus a. acutus is found in all of 

 the Coastal Plain, and as far west in the Piedmont as eastern Caswell 

 County. Orconectes virginiensis is known from Bertie, Halifax, and 

 Martin counties. 



Chowan River — The Chowan River basin is confined to the 

 northeastern Coastal Plain, rising at the confluence of the Nottoway 

 and Blackwater rivers just south of the Virginia state line. The southeast- 

 flowing Meherrin River heads in Virginia, enters North Carolina to 

 form part of the northern boundary between Northampton and Hertford 

 counties, then turns east across Hertford County to join the Chowan 

 at the Gates County line. The system drains northern and eastern 

 Northampton, Hertford, and most of southern and western Gates, 

 western Chowan, and northeastern Bertie counties, then empties 

 into the western arm of Albemarle Sound. 



The crayfishes of the Chowan basin are C. diogenes, F. fodiens, 

 P. a. acutus, O. virginiensis, and possibly C. sp. C. The listing by 

 Harris (1903:53) of C. b. bartonii in the Chowan basin (in Virginia) 

 was in error, and was probably based on Faxon's (1885:61) erroneous 

 report of the species from Southampton and Lunenburg counties, 

 which also was repeated by Ortmann (1931:131) 



Pasquotank River — North of Albemarle Sound, the streams 

 that form the northern part of this Coastal Plain system rise in the 

 southeastern tip of Virginia and in eastern Gates County, North 

 Carolina. This part of the basin includes the Pasquotank River that 



