ST. IVES, CORNWALL. — On the 29th March, during a storm and tremendous sea, accompanied by blinding showers of hail and snow, the ketch Greyhound, of Porthcawl, was observed running for the harbour. The. Life-boat Covent Garden was launched and proceeded towards the vessel, and after most strenuous efforts on the part of the Life-boatmen they succeeded in getting alongside her. They then ran warps from the pier to the ketch, and were thus enabled, after great exertions, to assist in getting her into a place of safety. She had a crew of 3 men..