The distribution of fatty acids and fatty aldehydes of total lipids in mantle, foot and digestive gland of two prosobranch gastropod mollusks, Bellamya bengalensis and Pila globosa, from India were studied. The individual volatile compounds, e.g., acids and aldehydes, were separated by serially coupled capillary columns with different polarity stationary phase and identified by gas chromatography-mass spectrometry. Saturated fatty acids were the main components and vary from 48-60%, monoenic are 18-30%, while polyunsaturates vary between 21-33%. The digestive glands of both the snail species contained cyclopropane fatty acids, not previously reported in gastropods.