The picture shows the small burial chamber under a grassy mound.
The skulls in these tombs were found facing the center of the burial chamber.
It must suffice to say that the earliest examples are only to be distinguished from the mural decorations employed by their pagan contemporaries (as seen at Pompeii and r Mommsen's chosen example of an ancient burial-chamber, extending itself into a catacomb, or gathering subterranean additions round it till a catacomb was established, is that of the cemetery of St Domitilla, traditionally identified with a granddaughter of Vespasian, and the catacomb of Santi Nereo ed Achilleo on the Appian and Ardeatine way.
This was the reason an area of the burial chamber was known as sniveling corner.
A chamber containing horses was discovered adjacent to the Duke's burial chamber.