The doorways which are seen interrupting the lines of graves are those of the family sepulchral chambers, or cubicula, of which we shall speak more particularly hereafter.
Table-tombs and arcosolia are by no means rare in the corridors of the catacombs, but they belong more generally to the cubicula, or family vaults, of which we now proceed to speak.
These cubicula are small apartments, seldom more than 12 ft.
11 and 12), taken from De Rossi's great work, representing two of the cubicula in the cemetery of St Calixtus, show the general arrangement of the loculi and the FIG.
Some curious frescoes representing these funeral-feasts, found in the cubicula which were the scene of them, are 3; „ I,I - _..
We have already spoken of the eucharistic celebrations of which the cubicula were the scene; and still existing baptisteries prove that the other sacrament was also administered there.
Yet it is in this stratum, and in this alone, that the catacombs are constructed; their engineers avoiding with equal care the solid stone of the tufa litoide and the friable pozzolana, and selecting the stratum of medium hardness, which enabled them to form the vertical walls of their galleries, and to excavate the loculi and cubicula without severe labour and also without fear of their falling in.
In 1899-1900 were discovered two opposite cubicula in the catacomb of Santi Pietro e Marcellino.