V. Subterranean side-passage, called of Commodus.
a. The dens for wild beasts.
b. The shaft for a man to descend and feed the animals.
c. The drain and flood-gate at the mouth of it.
e, e. Small brick chambers of the time of Nero.
All the sockets that are visible are shewn in the plan, whether in the passages or in the chambers.
THE COLOSSEUM.
PLATE IX.
ARCHES IN THE SUBSTRUCTURE.
COLOSSEUM.