Bui. U.S. B. F., 1917-18 PLATE XXII. 
Upper left and middle right; Pink heel-splitter, Lampsilis alata (Say), from Mississippi River. (See p. 33.) 
Lower left and lower right: White heel-splitter, Symphynota comblanata (Barnes), from Kankakee River. (See p. 34 -) 
