Chapter IV: Rulers of the Ancient Seas

The Mosasaurs, 49; history of the first known Mosasaur, 50; jaws
of reptiles, 53; extinction of Mosasaurs, 55; the sea-serpent,
56; Zeuglodon, 58; its habits, 59; Koch's Hydrarchus, 61; bones
collected by Mr. Schuchert, 63; abundance of sharks, 64; the
great Carcharodon, 65; arrangement of sharks' teeth, 67;
references, 68.