4. The crangon is different, for it has, first of all, four plates on each side, and, afterwards, three slight ones, continuous with those on each side, and the greater part of the remainder of its body is apodal; all the feet are directed outwards to the side, like those of insects; but the claws, in those that have them, all turned inwards. The carabus also has a tail, and five fin-like appendages. The cypha, among the carides, has a tail, with four fin-like appendages. The crangon has fin-like processes on each side of the tail, and the middle of them is spinous on both sides; but this part is wide in the crangon, and sharp in the cypha. The carcini alone are without a tail; the body of the carabi and carides is elongated, that of the carcini is rounded. 5. The male carabus is different from the female, for the female has the first foot divided; in the male it is formed of a single claw, and the fin-like process on the lower part is large in the female, and interchanged with each other in the neck; in the male they are small and not interchanged. In the male, also, the last feet are furnished with large and sharp processes like spurs; in the female these are small and smooth. They all have two large and rough processes, like horns, before their eyes, and two, smaller and smooth, below. 6. The eyes of all these animals are hard, and capable of motion, inwards, outwards, and to the side; the same is the nature of the carcini, in which they are even more moveable. In colour the astacus is all of a dull white, sprinkled with black; it has eight small feet, as far as the large ones; after these the large feet are far greater and wider at the extremity than in the carabus, and they are unequal in size; for on the right side the broad part at the end is long and smooth, on the left side the same part is thick and round; they are both divided from the extremity like a jaw, with teeth above and below, only that in those on the right the teeth are all small and sharp, and they are sharp at the extremity of the left side; in the middle they are like molar teeth; in the lower part are four close together, but in the upper part three, but not close together. 7. In both claws the upper part is moved and pressed down upon the lower; both are placed sideways in position, as if intended by nature for seizure and pressure; above these large feet are two rough ones, a little below the mouth; and still lower, the branchial organs around the mouth, which are rough and numerous, and these are continually in motion; it bends and approximates its two rough feet towards its mouth; the feet near the mouth have smooth appendages.