A slave named Aleck Bagby, owned by Dr. Samuel Fauntleroy, of King and Queen, on yesterday evening bit off the entire lower lip of Fleming Pryer; a slave, owned by W. R. Robinson, Esq., in a fight, at the factory of the latter, on Franklin, below 20th street--Dr. James Dove was summoned in haste, and stitched on the dissevered part.