THE SHARK differs from the whale in not being one of the mammalia. It is cold-blooded, and does not suckle its young. It has no lungs, and its mode of breathing is like that of other fishes, except that its gills are fixed, and the water escapes by five apertures on each side. The body of the Shark is elongated, and tapers gradually from the head to the tail, or is very slightly dilated in the middle. Its muzzle or nose is rounded, and projects very much over the mouth, the nostrils being situated on the under side. The male shark is smaller than the female, and differs from it in appearance, in possessing two elongated appendages, one of which is attached to the hinder edge of each of the ventral fins. The purpose which these appendages are intended to serve is not known. Some of the Sharks produce their young alive, and others lay eggs contained in horny cases of an oblong shape, with long tendrils at each of the four corners. After the young Sharks are hatched, these curious cases are often washed on shore, and are called mermaids’ purses. The bones of the Shark are like gristle, and very different from those of most other fishes. Hence all the fishes with bones similar to those of the Shark are placed in a separate order, and called cartilaginous fishes. The White Shark is sometimes found weighing nearly two thousand pounds. The throat is often large enough to swallow a man; and a human body has sometimes been found entire in the stomach of this tremendous animal. He is furnished with six rows of sharp triangular teeth, which amount in all to a hundred and forty-four, serrated on their edges, and capable of being erected or depressed at pleasure, owing to a curious muscular mechanism in the palate and jaws of the Shark. The whole body and fins are of a light ash-colour; the skin rough, and employed to smooth cabinet work, or to cover small boxes or cases. His eyes are large and staring, and he possesses great muscular strength in his tail and fins. Whenever he spies, from the deepest recesses of the sea, a man swimming or diving, he darts from the place, up to his prey, and if unable to take in the whole, or snatch away a limb, he follows for a long time the boat or vessel in which the more nimble swimmer has found a safe and opportune retreat: but seldom does he let any one escape his jaws, and get off entire. Sir Brook Watson was swimming at a little distance from a ship, when he saw a Shark making towards him. Struck with terror at its approach, he cried out for assistance. A rope was instantly thrown; but even while the men were in the act of drawing him up the ship’s side, the monster darted after him, and, at a single snap, tore off his leg.