Bull. U. vS. B. V., 1917-18. 



I'LATIC XIV. 



upper pair: Southern mucket, Lampsilis ligamentina gihha (Simpson), from Black River, Ark. 

 Middle pair: Higgin'seye, Lampsilis kigginsiz (Lea), from Mississippi River. (See p. 29.) 

 At bottoni: La^npsilis orbiculata (Hildreth), from Cumberland River. (See p. 29.) 



(See p. 28.) 



