Note 3340 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES. (continued 2)

“Horn of [Jupiter] Hammon.” He here alludes to the Ammonites of modern Geology, an extinct race of molluscous animals that inhabited convoluted shells, and which are commonly known as “snake-stones.” They abound in strata of the secondary formation, and vary from the size of a bean to that of a coach-wheel.