JUi.i.. U. S. B. F., 1917-18. 



ri.ATi.; XIII. 



Upper and middle: Mucket, Lampsilis Uaamentina (Lamarck). (See p. 28.) 



At bottom: Rainbow-shell, Lampstlis ins (Lea), from Tippecanoe River, Ind. (vSee p. 28.) 



