2. All fish, except the cestreus, eat one another, especially the congers. The cephalus and the cestreus alone are not carnivorous. This is a proof of it. They are never captured with anything of the kind in their stomach, nor are they captured with a bait made of flesh, but with bread; the cestreus is always fed upon sea-weed and sand. One kind of cephalus which some persons call chelone lives near the land, another is called peræas. This last feeds upon nothing but its own mucus, for which reason it is always very poor. The cephalus lives upon mud, wherefore they are heavy and slimy. They certainly never eat fish, on account of their dwelling in mud; they often emerge in order to wash themselves from the slime. Neither will any creature eat their ova, so that they increase rapidly, and when they increase they are devoured by other fish, and especially by the acharnus. 3. The cestreus (mullet) is the most greedy and insatiable of fish, so that its abdomen is distended, and it is not good for food unless it is poor. When alarmed it hides its head, as if its whole body were thus concealed; the sinodon also is carnivorous, and eats the malacia. This fish and the channa often eject their stomachs as they pursue small fish, for their stomach is near the mouth, and they have no œsophagus. Some are simply carnivorous, as the dolphin, sinodon, chrysophrys, the selache and malacia; others, as the phycis, cobius, and the rock-fish, principally feed upon mud and fuci, and bryum, and what is called caulion, and any matter which may be produced in the sea. The phycis eats no other flesh than that of the shrimps. They also frequently eat each other, as I before remarked, and the greater devour the less. It is a proof that they are carnivorous, that they are captured with bait made of flesh. 4. The amia, tunny, and labrax generally eat flesh, though they also eat sea-weed. The sargus feeds after the trigla when the last has buried itself in the mud and departed, for it has the power of burying itself, then the sargus comes and feeds and prevents all those that are weaker than itself from approaching. The fish called scarus is the only one which appears to ruminate like quadrupeds. Other fish appear to hunt the smaller ones with their mouths towards them, in this way they naturally swim; but the selachea, dolphins and cetacea throw themselves on their back to capture their prey, for their mouth is placed below them, for this reason the smaller ones escape, or if not they would soon be reduced in number; for the swiftness of the dolphin and its capacity for food appear incredible.