[PLATE VII.]

Fig. 1. An “Asterid.” This is different from all the other creatures in these fossils. Its position in the heart of a solid limestone pebble is singular.—(Beach at Hove.)

Fig. 2.—“Terebratula.” The entire pebble was formed inside of a “Pecten”-shell, and inside the pebble lies this formation, which was a living organism connected with the hinge.—(Beach near Luccombe.)

EXPLANATION OF CERTAIN TERMS used in this Volume.

“Hard:” that which will cut or scratch other substances.

Example.—A diamond will cut glass.

“Tough:” tenacious; whose particles are difficult to separate from one another.

Example.—Jasper, though not nearly so hard, is more “tenacious” than diamond.

“Transparent:” through which we can see objects.