THE HAMMERHEAD. The Hammerhead is chiefly distinguished by the singular form of its head, which is flattened horizontally, and the sides prolonged, giving it the appearance of the head of a hammer. The eyes of this Fish are placed at the extremity of these hammer points of the head; they are grey, projecting, and the iris is gold-colored. When the animal is irritated, the colors of the iris become like flame, to the horror of the fishermen who behold them. Beneath the head and near to the junction of the trunk is the mouth, which is semi-circular, and furnished on each jaw with three or four rows of large teeth pointed and barbed on two sides. The most common species in our seas is long and slender in the body, which is grey, and the head is black. It usually attains the length of eleven or twelve feet, weighing occasionally nearly five hundred pounds. Its boldness and voracity, and craving for blood, are more remarkable than its size. If the Hammerhead has not the strength of the Shark, it surpasses it in fury; few Fishes are better known to sailors in consequence of its striking form. Its voracity often brings it round ships and near the coast. Its visits impress themselves on the memory of the sailor, and he loves to relate his hair-breadth escape from the meeting. THE SAW-FISH. The Saw-fish is distinguished from all other known Fishes by the formidable arm which it carries in its head. This weapon is a prolongation of the nose, which, in place of being rounded off or reduced to a point, forms a long, straight, strong, sword-like termination, flat on both sides, and on the two edges furnished with numerous strong teeth, giving the appearance of a double saw, or one with teeth on both edges. Thus armed, the Saw-fish—the length of which is from twelve to fifteen feet—fearlessly attacks the fiercest inhabitants of the ocean. With this threatening weapon, sometimes two yards in length, it dares to try its strength with the Whale, and in a combat between the two, the Saw-fish is usually victorious. The Saw-fish is sometimes called the Sword-fish because of the sword-shape of its long saw, but it should be remembered that these Fishes are entirely distinct, for the Saw-fish belongs to the class of Cartilaginous Fishes, while the real Sword-fish, whose sharp sword is strong and smooth—without the saw-like teeth—is found among the Osseous or bony Fishes in the Mackerel family. THE STURGEON FAMILY. [Illustration: STURGEON.] The principal Fish belonging to this family are the different kinds of Sturgeon and the strange Chimaera, concerning which so many weird tales have been told.