Note PG75 — DRAMATIS PERSONÆ.
Rich. Fr. Phil. (Richard François Philippe) Brunck translation
Echinus was a town on the Thessalian coast, at the entrance to the Maliac Gulf, near Thermopylae and opposite the northern end of the Athenian island of Euboea. By the "legs of Megara" are meant the two "long walls" or lines of fortification connecting the city of Megara with its seaport Nisaea—in the same way as Piraeus was joined to Athens.