 Museum and literature records of "Alasmidonta marginata" from the Cumberland River drainage on the Cumberland Plateau should be verified because they may actually represent the Cumberland elktoe.Cicerello and Laudermilk maintains that these two species occur sympatrically in the Rockcastle River, contrary to the assertion by Gordon and Layzer that they are allopatric.The Cumberland elktoe has apparently been extirpated from the main stem of the Cumberland River and Laurel River and its tributary, Lynn Camp Creek.