Bui. U. §. B. F., 1917-18. PLATE XIV. 
Upper pair: Southern mucket, Lampsilis ligamentina gibba Simpson, from Black River, Ark. (See p. 28.) 
Middle pair: Higgin’s eye, Lampsilis higoinsii (Lea), from Mississippi River. (See DP. 29.) 
At bottom: Lampsilis orbiculata (Hildreth), from Cumberland River. (See p. 29.) 
