SKEGNESS.—A signal of distress was displayed in the fore-rigging of the sloop Unity, of Boston, bound from Lynn for Sunderland with a cargo of wheat, on the morning of the 25th October, during a fresh N. breeze with snow-squalls and a heavy sea. The Life-boat Herbert Ingram was launched at 9.30; proceeded to the vessel, which was in a leaky and disabled condition, having lost her main-boom and some of her rigging, and assisted to take her to Boston..