 After fertilization, the eggs develop into trochophore larvae, and the eggs subsequently hatch as free swimming microscopic veliger larvae, which can be carried some distance on ocean currents.Growth is slow, and the veligers are carried by the ocean currents for up to 14 weeks.As the veligers mature, they develop their first shell (the smooth protoconch) and turn into very small juvenile snails, at which point they sink to the ocean floor.