Buy. U.S. B. F., 1917-18. IRATE Revell 
Upper: Lake Pepin mucket, Lampsilis luteola (Lamarck). (See p. 29.) 
Middle: Yellow sand-shell, Lampsilis anodontoides (Iea). (See p. 31.) 
Lower: Pocketbook, Lam/psilis ventricosa (Barnes). (See p. 30.) 
