When he first finds the conch, Piggy states that he once saw one on a person’s wall in England and that it’s “ever so valuable.”
This association and the fact that the boys use the conch to call a meeting immediately establish the conch as a symbol. What does the conch symbolize?
Alliteration is repeating the same sound or cluster of sounds in consecutive words and here you have "ragged" and "roamed" and "forest" and "foot", repeating sounds R and F.