Chapter VI.

1. Oviparous and sanguineous quadrupeds (for no sanguineous land animal that is not either a quadruped or apodal is oviparous) have a head, neck, back, upper and lower parts of the body, and fore and hind legs, and something resembling a breast, like oviparous quadrupeds: most of them also have a large tail, some a small one; all of them have many toes and divided feet, and all the organs of sense, and a tongue, except the Egyptian crocodile. And in this respect it resembles some fishes, for the tongue of fishes is thorny, and not free, and in some the place for the tongue is altogether smooth, and without division (so that nothing is visible), unless the lips are drawn aside.

2. They have no ears, only a passage for hearing; neither have they any mammæ, and the penis and testicles are internal, and not external. They have no hair, but are covered with scales, and all are furnished with sharp teeth. The river-crocodiles have eyes like hogs, and great sharp teeth, strong claws, and an unbroken scaly skin. In the water their sight is imperfect, but very good on land. They pass the greatest part of the day on land, and of the night in the water, for they cannot bear the cold air.