Description: Polinices lacteus (Guilding, 1834) - abapertural view of a milk moonsnail shell, 1.55 cm tall. Family Naticidae - the naticids, like the muricids, prey on bivalves by boring through their shells. Date: 19 February 2011, 21:14. Source: Polinices lacteus (milk moon snail) (San Salvador Island, Bahamas) 1. Author: James St. John.