Note 11 — Chapter IV · PART I. THE AQUEDUCTS.
Reading edition
That is, in the reservoir, or castellum aquæ, through which the conduit or specus passed. This reservoir exists, or rather considerable remains of it, just within the Porta Maggiore, between that and the church of S. Croce, and just outside the agger of the Sessorium, on which the road from S. Croce to this gate now runs.