In the upright walls of these galleries loculi were cut as needed to receive the dead.
Another unfrequent mode of interment was in graves like those of modern times, dug in the floor of the galleries (Marchi, u.s., ta y.
The idea of general intercommunication is negatived by the fact that the chief cemeteries are separated by low ground or valleys, where any subterranean galleries would be at once filled with water.
To the eye the contrast between the wide winding irregular passages of the sand-pit, calculated for the admission of a horse and cart, and the narrow rectilinear accurately-defined galleries of the catacomb.
When these first four galleries were full others were mined on the same level at right angles to them, thus gradually converting the whole area into a net-work of corridors.