Belemnites. Fossilized bony end of extinct cuttlefish. From Aldrovandi’s “Museum metallicum,” Bononiæ, 1648. ] Fossils whose form suggested that of a more or less acutely pointed shaft, were thought to possess special powers, sometimes offensive as against enemies, and again defensive for the protection of the wearer. Thus the belemnites,[395] considered to represent the form of a dart, when dissolved and taken as a potion, were said to prevent nightmare and to guard against enchantments. They are often either ash-colored or whitish, and sometimes reddish-black. All these varieties were frequently found during the sixteenth century in Hildesheim, and in the marble grotto near the castle of Marienburg, called the “Dwarf’s Grotto.”[396] The umbilicus marinus, a fossil shell, which in form bore a great likeness to the human navel, was called “sea-bean” by sailors. Usually of a pale saffron hue, some specimens have a reddish or blackish tinge. In the sixteenth century it was believed to have astringent properties. We are also told that women used it as one of the ingredients of a cosmetic for whitening the complexion.[397] Certain echinites (fossil sea-urchins) found on the Baltic coast are called by the peasants _Adlersteine_ and _Krallensteine_ (“eagle-stones” and “claw-stones”), since they believe that while the substance was soft eagles had seized them with their talons, thus producing the peculiar forms and markings. Whoever had a fossil of this description on his table while a thunder-storm was raging ran no risk of being struck by lightning.[398] Reich describes another variety of echinite, which was popularly known as a “toad-stone,” the specimen he figures having been given him by a certain Johannis Krauss. In this appeared some large cavities, whose presence Reich found it very difficult to explain, until Krauss informed him that they had been made by a former owner of the fossil who had scraped out a few grains of the substance each year for medicinal use. He was persuaded that his long life—he attained the age of eighty—was entirely owing to his employment of this remedy.[399]