ANTRUM (Notitia)
ATRIUM (Curiosum) CYCLOPIS
mentioned only in the Regionary Catalogue (Region I), was probably a grotto in the side of the hill, above the VALLIS CAMENARUM (q.v.). While it is not possible to decide with certainty between these two readings, antrum is probably correct, and this grotto may possibly be the antrum Volcani of Juvenal (i. 7). The antrum Cyclopis gave its name to a vicus Cyclopis (CIL vi. 2226), which may have extended south-west to the via Appia (HJ 208, 230; RE iv. 1905).