Arrived on Thursday Morning at Spithead, from Plymouth, H.M.S. Cornwallis, 71, Captain Sir Richard Grant, knt. She is destined to supply the place of the Melville, 78, on the West India station, whither she will convey Vice-Admiral the Hon. Sir Charles Paget, K.C.B., appointed to succeed Sir Peter Halket, promoted to Admiral. The Vice-Admiral is expected here in a few days, from his seat, Fair Oak Lodge, near Petersfield.Paget