CHAP. 40. (24.)—VARIOUS KINDS OF FLAT FISH.
There is another kind of flat fish, which, instead of bones, has cartilage, such, for instance, as the raia,1 the pastinaca,2 the squatina,3 the torpedo,4 and those which, under their respective Greek names, are known as the ox,5 the lamia,6 the eagle,7 and the frog.8 In this number, also, the squali9 ought to be included, although they are not flat fish. Aristotle was the first to call these fish by the one generic name of σελάχη,10 which he has given them: we, however, have no mode of distinguishing them, unless, indeed, we choose to call them the "cartilaginous" fishes. All these fish are carnivorous,11 and feed lying on their backs, just as dolphins do, as already12 noticed; while the other fishes,13 too, are oviparous, this one kind, with the exception of that known as the sea-frog, is viviparous, like the cetacea.14