3. But Mnaseas of Patra, in his Periplus, says that the fish in the river Clitor are not dumb; though Aristotle has stated in writing that the only fishes which have any voice are the scarus and the river-hog. And Philostephanus, who was a Cyrenæan by birth, and a friend of Callimachus, in his treatise on Extraordinary Rivers, says that in the river Aroanius, which flows through Pheneum, there are fish which sing like thrushes, and that they are called the poiciliæ. And Nymphodorus the Syracusan, in his Voyages, says that there are pike in the river Helorus, and large eels, so tame that they take bread out of the hands of any who bring it to them. And I myself, and very likely many of you too, have seen cestres tamed to the hand in the fountain of Arethusa, near Chalcis; and eels, having silver and golden earrings, taking food from any one who offered it to them, and entrails from the victims, and fresh cheese. And Semus says, in the sixth book of his Delias—"They say that a boy once dipped a ewer into the well, and brought water to some Athenians who were sacrificing at Delos, to wash their hands with; and he brought up, as it happened, some fish in the ewer along with the water: and that on this the soothsayers of the Delians told them that they should become the lords of the sea." [Sidenote: AQUATIC ANIMALS.] 4. And Polybius, in the thirty-fourth book of his Histories, says that behind Pyrene, as far as the river Narbo, the whole country is a plain, through which the rivers Illiberis and Rhoscynus proceed, flowing through cities of the same name as themselves, which are inhabited by some of the Celtæ; and in this plain he says that the above-mentioned fossil fish are also found. And he says that the soil of that plain is light, and that a great quantity of the herb agrostis grows in it; and that beneath it, as the soil is sandy for a depth of two or three cubits, the water flows, which wanders away from these rivers; and so the fish, too, leaving the rivers, and proceeding underground, in the course of these erratic underflowings, in quest of food (for they are exceedingly fond of the root of the agrostis), have caused the whole plain to be full of subterranean fish, which people catch when they dig up the plain. "And among the Indians," says Theophrastus, "there are fish which go forth out of the rivers over the land, and then, leaping back, return again to the water, just like frogs; being in appearance very like the fish which are called maxini."