—— and one near the Porta Furba, at two miles from Rome, at the foot of the great aqueduct ib. A branch of the Anio Vetus (?) ib. XV. ALEXANDRINA. This aqueduct mentioned by Lampridius 97 —— Made to bring water to the Thermæ of Alexander Severus, near the Pantheon ib. —— Probably a branch from the great aqueducts near the Porta Maggiore ib. An inscription found near that point ib. Remains of arcade of this period between that gate and the Minerva Medica 98 Nymphæum of Alexander Severus, where the Trophies of Marius were hung 99 Nymphæum, a hall of the Thermæ for women; Pantheum, a similar hall for men ib. Wall of Aurelian built against this tall arcade ib. XVI. ALGENTIANA. This aqueduct made to supply water to the Thermæ of Diocletian 100 Remains of a large _piscina_ were found on the site of the railway station ib. The water is said to have been brought by a branch from the Marcia at the Porta di S. Lorenzo ib. Others say it came from Mons Algidus, near Tusculum, and was brought underground, with reservoirs on the tops of hills in the Campagna, supplied by syphons ib. XVII. AQUA CRABRA AND MARRANA. These streams united are brought into Rome in the bed of the River Almo 101 Sources of the Aqua Crabra, near Rocca di Papa ib. Those of the Marrana near Marino ib. The two united at the foot of the hill of Marino 102 _Piscina_ in the valley under Marino ib. _Specus_ traced in the same valley near the quarries of _peperino_ or _lapis Albanus_ ib. —— passes under the sources of the Aqua Julia ib. The two streams united near a bridge on the road to Grotta Ferrata, ten miles from Rome ib. Part of the united water runs into the river Anio ib. Another part is brought through the tunnel of the Aqua Julia (V.) ib. —— then in a cutting to the bed of the small river Almo ib.