There was Trusty in the late 1850's, on which Coles placed an armored turret for the Admiralty after his return from the Crimea for test purposes, again an adaptation of a floating battery, not a true 'ship'.
Cole's Rolf Krake, Europe's first turreted vessel, a gunboat built for the Danish Navy, wasn't finished until after the Monitor - Virginia battle. The South American vessels didn't happen until the 1864/65 time frame.
Other than these, I'm lost.