Ennius Quirnus Visconti (1751-1818) and his son Louis Tullien Joachim Visconti (1791-1853).
An Italian archeologist, Ennius was curator of the Capitoline Museum in Rome before supervising the antiquities room at the Louvre. He was originally buried in what is now division 10 but removed to division 4 next to his son, architect and designer Louis Tullien. Louis designed many Parisian buildings and squares, including the Place Saint Sulpice, but is perhaps most well-known for designing the tomb of Napoleon at Les Invalides.
Shown below is from Normand's 1832 study of sculpture in the cemetery followed by a contemporary photo.