(MD) (Natural History Society of Maryland) The Potomac River is a snail haven, home to almost half of these known species. In this presentation, Aydin Orstan, Ph.D. will report on his recent two-year snail survey, which added three more species to the list: Cipangopaludina cf. japonica, Gillia altilis, and Laevapex fuscus.  Aydin will introduce the snails, including the largest native species, Campeloma decisum, with shells up to 1.3 inches long. In addition to information about snails, tips about kayaking safely in the river, and good spots to see snails will also be shared.