The _trochites_ and _entrochus_, named Räderstein, or “wheel-stone,” by the Germans, are other fossils to which remedial or talismanic virtue was accorded in popular fancy. These “wheel-stones,” while detachable, fitted as closely together in the original formation as though they had been skilfully adjusted by a clever artisan.[400] De Laet states that when immersed in oil they gave forth bubbles and moved about spontaneously. Still another of these fossils believed to be amulets was the _enastros_, which De Boot terms the _asteria vera_, or genuine asteria, since it not merely showed a star-shaped marking as did the fossil coral bearing the name astroites, but was shaped like a five-pointed star. As with the _trochites_, chains of these little stars were found, closely joined together but separable from one another. Some called them “star-seals,” because the stellar imprint was sharp and clearly defined as though the work of an engraver or gem-cutter.[401] These fossils are types of encrinites. [Illustration: Brontia. Fossil sea-urchins. From Mercati’s “Metallotheca Vaticana,” Romæ, 1719. ] [Illustration: TROCHITES] [Illustration: ENASTROS] Trochites│Fossil │Crinoid From Mercati, “Metallotheca Vaticana,” Romæ, 1719. Enastros │Stems. The sections of the stem-like fossils called _entrochus_ by the older writers have been named St. Cuthbert’s beads in later times, while the fossil called _lapis Judaicus_ has borne the name of “stone-lily,” because in form it resembles the lily. Ages ago the stem and flower-like head united constituted a crinoid (a marine zoophyte). These aquatic creatures—half-plant and half-animal—usually twine their roots about some shell in the depths of the waters, but sometimes they become detached and then, moving their delicate tentacles, they creep along the bottom of the sea. [Illustration: Bucardites triplex. From Aldrovandi’s “Museum metallicum,” Bononiæ, 1648. ] In olden times parts, or segments, of an animal were worn as a protection against harm from that particular creature, or else to endow the wearer with some of its real or fancied qualities. In modern times this tendency finds expression in the wearing of jewels of animal form, wherein precious stones are grouped and arranged so as to constitute different parts of the creature’s body. Such jewels are often looked upon as “mascots.”