Curtius, E., Penthaus (88. Berliner Winckelmannsprogramm, Berlin, 1929, p. 1, fig. 1. Diehl, E., Die Hydra, Formgeschischte und Verwendung im Kult des Altertums, Munich, 1964, pl. 7,3, pl. 10, 1 and 3, ... Agora 12 452 ... ), Locust Valley, N.Y., 1964, pp. 204-227, figs. 1-23, fig. 4, fig. 14, pp. 153-159, figs. ... fig. 66, pp. 57-58, figs. 73-74, pp. 64-65, figs. 81-82 and pl. 5, p. 67, fig. 84, ... 3rd edition, London, 1964, pp. xxviii and 43, figs. 19 and 71, 179, p. 45, fig.