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Aperture: opening in the end or area of a mollusc shell out of which soft, internal body parts may emerge.
Calcareous: containing free calcium carbonate, chalky.
Hermaphrodites: possessing both male and female sex organs.
Self-fertilise: fusion of male and female sex cells (gametes) from one individual. In contrast, cross-fertilisation, two different individuals are involved.
Whorls: in animals, the spiral or convolutions in the shell of a snail. In plants, a set of leaves, flowers, or branches that spring from a stem at the same point and encircle it.