A B C. Line of the Section.

a. Colosseum.

b. Claudium.

c. Arch of Dolabella.

d. Reservoir and Spring of water.

e. Aqueduct of Nero.

f. Cave-reservoir and Spring, with ten wells down into it, erroneously called a vivarium.

g g g. Porticus of the Claudium.

h. Church of SS. John and Paul.

i. —— S. John of Mata.