The conch shell really represents control and a governing hand. However, it also represents justice because whoever holds the conch is to have the right to speak. So this "justice" only lasts a few chapters. After growing tired of all of the rules, Jack and his group don't care about following the conch any more. They speak when they want to--and feel that only those who SHOULD speak will speak. So at this point, justice is gone. There is no equality and only a handful of boys are following the rules.