Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 53. Chapters: Pseudamnicola, Phantom cave snail, Tryonia, Potamopyrgus, Pyrgula annulata, Somatogyrus, Alamosa springsnail, Littoridina gaudichaudii, Paludiscala de oro snail, Sardopaladilhia, Ventrosia ventrosa, Cincinnatia, Belgrandia varica, Hydrobia, Cahaba pebblesnail, Beddomeia, Bythiospeum pfeifferi, Cochliopa, Belgrandiella, Onobops jacksoni, Littoridinops tenuipes, Littoridinops monroensis, Floridiscrobs dysbatus, Littoridinops palustris, Pyrgophorus platyrachis, Bliss Rapids snail, Marstonia pachyta, Hydrobia acuta neglecta, Grand Wash springsnail, Heleobops docimus, Heleobops carrikeri, Falniowskia neglectissima, Onobops crassus, Texadina sphinctostoma, Graecoanatolica macedonica, Pyrgophorus coronatus, Texadina barretti, Nanivitrea helicoides, Islamia, Nanivitrea alcaldei, Marstonia agarhecta, Enterprise siltsnail, Tanousia, Hauffenia sp. nov., Jardinella, Mexipyrgus churinceanus, Sadleriana pannonica, Tanousia stenostoma, Marstonia olivacea, Mercuria, Oasis Valley springsnail, Marstonia ogmorhaphe, Ash Meadows pebblesnail, Sardopaladilhia subdistorta, Belgrandiella parreyssi, Alzoniella iberopyrenaica, Pyrgulopsis avernalis, Heleobia robusta, Sardopaladilhia distorta, Sardopaladilhia marianae, Roswell springsnail, Ventrosia maritima, Durangonella de Coahuila snail, Pahranagat pebblesnail, Naegele springsnail, Pseudamnicola artanensis, Sardopaladilhia buccina, Ichetucknee siltsnail, Hydrobia glyca, Alzoniella pellitica, Crystal siltsnail, Hydrobia djerbaensis, Pyrgulopsis castaicensis, Alzoniella marianae, Angrobia grampianensis, Idaho springsnail, Bythiospeum gloriae, Tanousia runtoniana, New Mexico hotspring snail, Moapa pebblesnail, Marstonia ozarkensis, Oachita pebblesnail, Trochidrobia minuta, Fenney Spring hydrobe, Fairbanks springsnail, Hidden pebblesnail, Phrantela, Belgrandia silviae, Angrobia petterdi, Green...