...ered, were held as hostages for the safety of our privateersmen, were sent away by special permission; and of the number so held, only two now remain--Lt. Col. Neff, of the 1st Kentucky regiment, and Maj. J. D. Potter , of the 38th New York volunteers. They have been in captivity for more than thirteen months, and are now retained only until the necessary papers can be made out. There are, we understand, twenty-e...