In the window is a monument--"To the memory of the Right Honourable SPENCER PERCEVAL, Chancellor of the Exchequer, and First Lord of the Treasury. This monument was erected by the Prince Regent and the Parliament, to record their deep sense of his public and private virtues, and to mark the nation's abhorrence of the act by which he fell. Born 1st November, 1762; assassinated within the walls of the House of Commons, 11th May, 1812." In bas-relief he is represented falling into the arms of the officers of the House of Commons in the lobby of the House, where the members are seen rushing forward to witness the sad catastrophe: the second figure to the left represents the assassin (Bellingham). A figure of Mr. Perceval is lying on a mattress, under which is a sarcophagus, the figure of power (with the fasces) weeping over him. At his feet are two figures, Truth (with the mirror), Temperance (the bridle).--_Westmacott, sculptor._ ROBERT and RICHARD CHOLMONDELEY.--The Latin inscription informs us that the second and fourth sons of Robert Viscount Cholmondeley, lie here interred. Robert, a King's scholar, died at fourteen, February 4, 1678; Richard died June 9, 1680. Both youths of promising genius. EDWARD MANSELL, eldest son of Sir Edward Mansell, of Margam, in Glamorganshire, Bart., who died June 20, 1681, aged 15. Against a pillar, on a tablet of white marble, is a long inscription in English, setting forth the descent of EDWARD HERBERT, Esq. He was lineally descended from Sir George Herbert, of Swansea, in Glamorganshire, first sheriff of that county after the union of the principality of Wales in 1542. He died Sept. 18, 1715, aged twenty-three, leaving one son, Thomas, then two years old. A double monument, being two oval tables between three wreathed pillars, neatly ornamented and inscribed; the first to the memory of WILLIAM MORGAN, second son of William Morgan, of Tredegar, in Monmouthshire, who died February 1, 1683, in the nineteenth year of his age; the other, THOMAS MANSEL, eldest son of Busy Mansel, of Britain's Ferry, Glamorganshire, who died December 13, 1684, aged thirty-eight. Mrs. JANE HILL.--This lady, who is here represented on a pedestal, in the ancient dress of her time, appears by the inscription to have been the daughter of Thomas Stoteville, of Brinkley, in Cambridgeshire, and wife, first to Edward Ellis, of Chesterton, and then to Othowell Hill, LL.D., and Chancellor of the diocese of Lincoln. She died April 27, 1631, aged seventy-eight. In the window above, is a monument to the memory of Miss ANN WHYTELL, who died 17th August, 1788. Upon an urn are leaning two figures of Innocence and Peace, having the emblems in their hands, the dove and olive-branch.--_Bacon, sculptor._