In the upright walls of these galleries loculi were cut as needed to receive the dead.
The fresco paintings in the galleries are perhaps the most interesting of the extant remains.
For example, a minute species (Solenopsis fugax) lives in a compound nest with various species of Formica, forming narrow galleries which open into the larger galleries of its host.
Two of the galleries are Romanesque, while two are Gothic. Arles has two other churches of the Romanesque period, and others of later date.
The level of the roadway is considerably lower than the ground-floors of the houses, which have generally arched rooms in front, with little shops behind them; and above these they are richly embellished with verandahs, galleries, projecting oriel windows, and very broad overhanging eaves supported by carved brackets.