εἰργάζοντο λογάδην φέροντες λίθους καὶ ξυνετίθεσαν ὡς ἕκαστόν τι ξυμβαίνοι → they went to work bringing the stones as they picked them out and put them together as each one happened to fit
cerrus: i, f.,
I a kind of oak, Turkey oak, Col. 7, 9, 6; Plin. 16, 5, 6, § 17; 16, 6, 8, § 19; Vitr. 2, 8; Pall. 1, 9, 3; id. Febr. 18, 3.