The land snail Cecilioides acicula (Family Ferussaciidae), a native of Europe, has been introduced to other parts of the world, including the U.S. In November 2006, I found this snail in Shenandoah County, Virginia. A short note reporting this finding has just been published in No. 15 of Triton, the Journal of the Israel Malacological Society. You can download the pdf copy of the paper from here.
Cecilioides acicula from Shenandoah County, Virginia, U.S.A. The adult shell was 3.1 mm long.