The burial chamber has been built for a mixed form of burial;
arcosolia for inhumation in the lower part of the walls and above
smaller niches for urns.
In the back-wall we find a large apsis-like niche flanked by two
small windows.
Both the right and the left wall do have a hemispherical niche with
a triangular tympanum above.
In the rounding of the large niches traces of stucco shells can
still
be seen.
There are also niches in the wall with the entrance.
Tomb 20 originates from 160-170 AD.
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