The portraits of two other species besides the Canicula have been so well delineated by the ancients, as to render the recognition of the originals perfectly easy, and exempt from any possibility of mistake. One of these is the Saw-fish of modern writers, described by Aristotle under the name of _Pristis_, and by Pliny under the Latin synonym _Serra_. The saw, or rake, of this shark is at first a supple cartilaginous body, porrect from the eyes, and extending sometimes fifteen feet beyond them. In the earlier stages of development it is protected in a leathery sheath; but hardening gradually as the ossific deposition proceeds, its toothed sides at length pierce the tough integument; the Serra flings away the scabbard, and, after a very little practice, becomes a proficient in the use of his weapon, and always ready for instant assault upon any body or any thing that may or may not offer molestation. Thus formidably armed, and nothing daunted, the larger and fiercer the adversary the more ardently the Serra desires to join battle; above all, the destruction of the whale seems to occupy every thought, and to stimulate to valorous deeds; no sooner is one of these unwieldy monsters descried rolling through the billows, than our expert Sea-fencer rushes to the conflict; and, taking care to avoid the sweep of his opponent’s tremendous tail, soon effects his purpose, by stabbing the luckless leviathan at all points, till he—exhausted by loss of blood—dies at last anemic, like Seneca in the bath. Martyns relates a fight off the Shetland Isles, which he witnessed from a distance, not daring to approach the spot, while the factitious rain spouted up from the vents of the enraged sea mammal, poured down again in torrents sufficient to swamp a boat, over the liquid battle field. He watched them a long time as they feinted, skirmished, or made an onslaught; now wheeling off, but only to turn and renew the charge with double fury. Foul weather, however, coming on, he did not see the final result of the fray; but the sailors affirmed that such scenes were common enough to them, and generally ended in the death of the whale; that when he was _in extremis_, the victor would tear out and carry away the tongue—the only part he cared for—and that, on his departure, they themselves drew near, and enjoyed undisputed possession of the huge carcase.