PENARTH, SOUTH WALES.—At daylight on the 9th March the Coastguard on duty observed a small vessel ashore in a verydangerous position on Cardiff sands. The wind was blowing strong from the W.S.W., accompanied by a heavy sea. The Lifeboat Joseph Denman was launched and proceeded to the vessel, which was found to be the ketch Bristol Packet, of Newport, Mon. The crew asked that the Life-boat might remain by the vessel, the master stating that she was strongly built, and that they hoped when the flood tide made she would float off the sands, which she eventually did, and bore away for Newport, the Life-boat then returning to her station..