The white shark is one of the largest of the tribe, and measures sometimes from twenty to twenty-five feet; there is however another, the _Squalus Maximus_, only met with in northern latitudes, which greatly transcends him; reaching, when fully developed, thirty and even forty feet in length. One taken off Marseilles with a whole man in armor, _integer et cadavere toto_, pouched in his stomach, affords some grounds for supposing that the great fish that swallowed the prophet Jonah was a shark; especially as this case of the warrior is not a solitary instance, for Rondolet relates the story of a man and his dog going down the open mouth of a shark into the stomach, the first to look about him and to say he had been there, the other to prowl round and pick up offal. That Jonah was swallowed by this _Piscis Anthropophagus_ is probable, though only conjectural; that he was not swallowed by a _whale_ is certain, for whales have very small gullets and no internal “accommodation for a single man,” like the shark; their food consists entirely of small narrow creatures an inch or two long, and not thicker round than the barrel of a common-sized quill. The origin of this mistake, perpetuated by sculptors and painters, proceeds from a misconception of the Hebrew word _tannanim_, translated _whale_, but evidently designating large fish generally; just as its Latin equivalent _cete_, signifies any heavy fish; size, not species, determining the appellation. Great as are the dimensions of many existing Squali, there can be no doubt that some of the antediluvian period greatly exceeded in size any species at present known. We are indebted to M. Lacepède for this discovery, and the ingenious procedure by which he arrived at it deserves notice. M. Lacepède was one of the first naturalists who applied the since well understood and more fully developed principle of _ex pede Herculem_ to the objects of natural history. Having received from Dax, in the Pyrenees, a shark’s tooth of the very unusual size of four inches and a half in the enamel, or the part visible above the socket, he was prompted to discover, if possible, the size of its original possessor; for this purpose he measured first the teeth, and next the bodies of all the Squali accessible to him in the museums of Paris, and found in every case, that the relative proportion they bore to each other was as one to two hundred, and applying this general scale to the particular tooth from Dax, M. Lacepède found that he held in hand the relic of a creature that in the days of the flesh must have been fully seventy feet long. The proportions between the body and the head being also definite, it was as readily made clear that a Squalus stretching to this length had jaws with a bow above thirteen feet, and a mouth capable of gaping more than twenty-six feet round. In comparison with such a Squalus, those chronicled by Rondolet requiring two horses