Note 82 — Chapter IV · PART I. THE AQUEDUCTS.
Reading edition
It is probably the case that part of this supply was brought in metal pipes only, from the evidence of this inscription. A stone specus passes under the wall on the bank round three sides of the camp on the exterior of the walls, and is plainly visible at the north-east corner; but this agrees with the general character of the Anio Vetus, and was probably a branch from that aqueduct.
The inscription is as follows:—
IMP. CAES. M. OPELLI . SEVERI . MACRINI . AVG M. OPELLI . SEVERI . DIADVMENIANI . CAES. PRINC. IV CASTRIS . PRAETORI TERENTIVS . CASSANDER . FECIT