What do you think is the significance of the snake thing or beasties? Consider the little boys description of the creature the discussion of nightmare Ralphs feeling that he is facing something ungraspable when confronted with this problem and he needs to

The snake thing or beastie is a figment of their own personal fears. They project their fear and insecurities on to an external "monster". This helps put their insecurities into some kind of understandable context. It is really Simon, the Christ-figure of the novel, that understands that the beast on the island is actually inside the boys.