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digestive gland in Viviparus bengalensis does not show prominent rhythmicity in enzyme secretion during the post-feeding period. Amylolytic, lipolytic and proteolytic enzymes are secreted at a slightly enhanced rate between the first and second hour after feeding, which is followed by gradual decline to become more or less constant. The secretion of different enzymes is synchronous. The absence of secretory rhythms during post-feeding period appears to be correlated with food-habits and feeding behaviour.