MONTROSE.—On August 17th, at 1 P.M., the herring-boat Vivid of Ferryden, got aground on the Annat Bank, with a fresh south-easterly breeze, a good deal of sea on the bank. The Life-boat Roman Governor of Caer-Bun was launched and proceeded to her assistance. By the time the Vivid was reached, however, she had floated off, and having towed her out of danger, the Life-boat returned to her station..