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Abstract
The shells and certain anatomical features including the genital system are described for Gyraulus convexiusculus (Hutton) from New Guinea, G. waterhousei (Clessin) and G. isingi (Cotton and Godfrey) from Australia, and Helicorbis australiensis (Smith) from Australia. The genera Glyptanisus Iredale, 1943 and Plana nisus Iredale, 1943 are regarded as synonyms of Gyraulus Charpentier, 1837. The genus Segnitilia Cotton & Godfrey, 1938 is regarded as a synonym of Helicorbis Benson, 1855.