Having purchased the box which is the subject of the following memoir from a dealer in antiquities in Rome, I took an early opportunity of showing it to my learned friend, Padre Garrucci of the Collegio Romano, knowing that no one was more capable than he of appreciating and illustrating an object belonging to the earlier ages of Christianity, and feeling sure that I might rely on his unfailing courtesy and willingness to impart to others the stores of knowledge and learning which he possesses.