GREAT YARMOUTH. — On the afternoon of the 16th February, the Life-boat Mark Lane was launched, and proceeded through heavy sea to the ketch Duguesclin, of Newcastle, which had shown a signal of distress while riding in the roads. She was found to be leaking, and the crew, consisting of 4 men, proposed to leave her. The Life-boat crew, however, worked at the pumps, and, with the aid of a steam-tug, the ketch was taken safely into harbour..