"Meghalaya, which includes the Garo, Khasi and Jaintia hills, is bordered by the Himalayas to the north and the Naga and Manipur hills to the east and is a fine example of upward wrap. The Khasi and Jaintia hills are at a higher alleviation than the Garo hills. The Shillong peak situated at an altitude of 1967 mtrs. is the highest point in the Khasi hills. Moryngksih in the Jaintia hills is at 1631 mtrs. followed by Nokrek at an altitude of 1515 mtrs. in Tura range of the Garo hills. The difference is altitude results in appreciable differences in the climate thereby influencing the flora and fauna in different habitats within the state. The mountain system stretching from central Garo hills in the west to the Mikir hills in the east comprises perhaps the oldest geological formation in north-east India. The present work is based on the named and unnamed material present in the National Zoological Collections of Zoological Survey of India and also on the records mentioned in the Fauna of British India : Mollusca by Blanford and Godwin-Austen (1908) and Gude (1914, 1921). The classification followed here is adopted from Subba Rao (1989) for freshwater molluscs and that of Taylor and Sohl (1962) for land molluscs."
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