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"The head was as long or longer than that of a fully grown grizzly bear, and the jaws were deeper in proportion to their length. The muzzle was shorter and deeper than that of a bull-dog. The teeth were all sharp cylindric fangs, smooth and glistening, and of irregular size. At certain distance in each jaw they projected three inches above the gum, and were sunk one inch into the jaw margin, being thus as long as the fangs of a tiger, but more slender. Two such fangs crossed each other on each side of the middle of the front. Besides the smaller fishes, the reptiles no doubt supplied the demands of his appetite."

- E.D. Cope

-Edward Drinker Cope describing the head and jaws of the giant prehistoric fish Xiphactinus.