installed by Niccolò Tribolo. By order of Cosimo I, the remaining work was completed by 1555 by Giorgio Vasari and Bartolomeo Ammannati. In a statement in a biography of Michelangelo that was published in 1553 by his disciple, Ascanio Condivi, and reportedly is based largely on Michelangelo's own recollections, Condivi gives the following description of the sculptures that were planned for the sarcophagi: The statues are four in number, placed in a sacristy... the sarcophagi are placed before the side walls, and on the lids of each there recline two big figures, larger than life, to wit, a man and a woman; they signify Day and Night and, in conjunction, Time which devours all things... And in order to signify Time he planned to make a mouse, having left a bit of marble upon the work (which [plan] he subsequently did not carry out because he was prevented by circumstances), because this little animal ceaselessly gnaws and consumes just as time devours everything. Concealed corridor discovered In 1976, a concealed corridor with drawings by Michelangelo on its walls was discovered under the New Sacristy. Cappelle Medicee The most celebrated and grandest part of San Lorenzo is the Cappelle Medicee (Medici Chapels) in the apse. The Medici were still paying for it when, in 1743, the last living member of the family, Anna Maria Luisa de' Medici, died. In 1742, she had commissioned Vincenzo Meucci to paint the Glory of Florentine Saints, a fresco, inside the cupola. Approximately fifty lesser members of the Medici family are buried in the crypt. The final design (1603–1604) was by Bernardo Buontalenti, based on models of Alessandro Pieroni and Matteo Nigetti. Above is the Cappella dei Principi (Chapel of the Princes), a great but awkwardly domed octagonal hall where the grand dukes are buried. The style shows Mannerist eccentricities in its unusual shape, broken cornices, and asymmetrically sized windows. In the interior, the ambitious decoration with colored marbles overwhelms the attempts at novel design. Its centre was supposed to feature the Holy Sepulchre, moved from Jerusalem, although attempts to buy and, failing that, to steal it failed.Ref.? Cappella Corbelli The Corbelli chapel, in the southern transept, contains a monument by the sculptor Giovanni Dupre to the wife of Count Moltke-Hvitfeldt, formerly Danish ambassador to the Court of Naples. Works of art Bronzino – The Martyrdom of St Lawrence, fresco, north aisle Desiderio da Settignano –