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In general, mollusks have 3 body regions: a head, a visceral mass, and a foot.. The head contains the sense organs and brain, while the visceral mass contains the internal organs. The foot is the muscular lower part of the body which is in contact with the substrate.
Other gastropod species have developed the ability to breathe air later. All marine gastropods, as well as some fresh water gastropods, breathe with gills. Snails originally possess the so-called comb-gills (ctenidia), which are also located in the pallial cavity.nails' excretion organs originally were derived from the segmented worms' (Annelida) metanephridia. While water snails excrete a very much diluted primary urine, terrestrial pulmonate snails have developed the ability to resorb most of the water.