Note 758 — ARTIFICIAL PEARLS.
William Johnston translation
That pearls are not peculiar to one kind of shell-fish, as many believe, was known to Pliny. I have a number of very good pearls which were found by my brother in Colchester oysters. It is more worthy of remark, and less known, that real pearls are found under the shield of the sea-hare, (Aplysia), as has been observed by Bohadsch in his book De Animalibus Marinis, Dresdæ, 1761, 4to, p. 39.