ORTMANN: FAMILIES AND GENERA OF NAJADES. 365 
Fic. 10. Lampsilis hydiana (Lea).—Bayou Pierre, De Soto Wei, IES 1 tp 
Frierson coll. Aug. 6, r910.—Carn. Mus., No. 61, 4,869. 
Fic. 11. Truncilla haysiana (Lea).—Cumberland River, Burnside, Pulaski Co., 
Ky., B. Walker don.—Carn. Mus., No. 61, 5,001. 
Fic. 12. Truncilla florentina (Lea).—Shoals Creek, Lauderdale Gor, Alasn Ets 
H. Smith coll. Nov. 2, 1909.—Carn. Mus., No. 61, 4,491. 
The scale at the bottom of the plate represents one millimeter divided into tenths. 
