MOELFRE, ANGLESEY.—On the night of the 21st December, during a thick fog, the schooner Isa, of Inverness, bound from Charlestown for Euncorn with a cargo of china clay, struck on the Dolas Bocks and became a total wreck. On the following morning, when the fog had slightly cleared, signals were seen, and the Life-boat Star of Hope immediately put off, and succeeded in saving the vessel's crew of four men, who had taken refuge on the rooky island..