I've got a question for all you long time residents. I took my 3 boys to Inlet Beach last week, and there was a purple flag up. I know that it's for "dangerous marine life", but read somewhere that it does not refer to sharks. There were other people swimming, so I assumed it was okay after not seeing anything in the water "dangerous". We went for a walk and came across literally hundreds to a thousand things that were on the beach and in the water that looked like snails, but not in shells. Can someone tell me what they are for future reference.