Kidney-shell, Ptychobranchus phaseolus (Hildreth), from Obey River, Ky., upper pair; Rock pocketbook, Arcidens confragosus (Say), from Mississippi River, lower pair. 1921. Ptychobranchus; Arcidens; Freshwater mussels.
Freshwater and Marine Image Bank, University of Washington Libraries Digital Collections
Kidney-shell, Ptychobranchus phaseolus (Hildreth), from Obey River, Ky., upper pair; Rock pocketbook, Arcidens confragosus (Say), from Mississippi River, lower pair.
Publisher:
Freshwater and Marine Image Bank, University of Washington Libraries Digital Collections
Coker, Robert E. 1921. Fresh-water Mussels and Mussel Industries of the United States. Washington, DC : Government Printing Office. Bulletin of the United States Bureau of Fisheries, vol. 36, 1917-1918; Plate XXI
