There are still some wonderful kinds of fishes which we find mentioned by Theophrastus: he says, that when the waters subside, which have been admitted for the purposes of irrigation in the vicinity of Babylon, there are certain fish which remain in such holes as may contain water; from these they come forth for the purpose of feeding, moving along with their fins by the aid of a rapid movement of the tail. If pursued, he says, they retreat to their holes, and when they have reached them, will turn round and make a stand. The head is like that of the sea frog, while the other parts are similar to those of the gobio, and they have gills like other fish. He says also, that in the vicinity of Heraclea and Cromna, and about the river Lycus, as well as in many parts of the Black Sea, there is one kind of fish which frequents the waters near the banks of the rivers, and makes holes for itself, in which it lives, even when the water reti............