[167] αὐτῶν refers to the Cyclopes in contrast to the flocks. The meaning of the addition ἐγγὺς ἐόντων is that they judged of the nearness of the land by being able to hear voices and see the smoke.
φθογγήν is joined with ἐλεύσσομεν by a sort of zeugma. Cp. S. c. T. 160 “κτύπον δέδορκα”, Aesch. P. V.21“ἵν᾽ οὔτε φωνὴν οὔτε του μορφὴν βροτῶν ὄψει”. Mayor refers to Lobeck, Rhemat. 329 foll., for illustrations of this sort of confusion in the use of words relating to the bodily senses.