[48] In some of these islands pearl oysters are found, especially in the Calamianes, where some have been obtained that are large and exceedingly clear and lustrous. Neither is this means of profit utilized. (By the Spaniards, he means, as is clear from the preceding paragraph, which states that, "if the industry and efforts of the Spaniards were to be converted into the working of the gold, as much would be obtained from any one of these islands as from those provinces which produce the most in the world. But since they attend to other means of gain rather than to this, as will be told in due time, they do not pay the proper attention to this matter.") In all parts, seed pearls are found in the ordinary oysters, and there are oysters as large as a buckler. From the (shells of the) latter the natives manufacture beautiful articles. There are also very large turtles in all the islands. Their shells are utilized by the natives, and sold as an article of commerce to the Chinese and Portuguese, and other nations who go after them and esteem them highly, because of the beautiful things made from them. "On the coasts of any of these islands are found many small white snail shells, called siguei. The natives gather them and sell them by measure to the Siamese, Cambodians, Pantanes, and other peoples of the mainland. It serves there as money, and those nations trade with it, as they do with cacaobeans in Nueva España." (Antonio de Morga, Sucesos de las Islas Filipinas, Chap. 8.--Bl. and Rb., Vol. 16, p. 103.) [49] Description of Filipinas Islands, Bartholome de Letona, 1662.--Bl. and Rb., Vol. 36, p. 201. "All these islands are, in many districts, rich in placers and mines of gold, a metal which the natives dig and work. However, since the advent of the Spaniards in the land, the natives proceed more slowly in this, and content themselves with what they already possess in jewels and gold ingots, handed down from antiquity and inherited from their ancestors. This is considerable for he must be poor and wretched who has no gold chains, calombigas (bracelets), and earrings.