USSIEUX, Jacques Gerard des (oos-se-uh), French naval officer, born in Eu, Normandy, in 1719; died in Port Royal, Martinique, in 1781. He was a captain in the merchant service, and during the war of 1756 he commanded privateers against the English, and defended the fortifications at the entrance of St. Lawrence river. After the conclusion of peace he entered the service of Louis Antoine de Bougainville, who had obtained from Louis XV. a grant of the Falkland islands, carried emigrants there in 1764, and governed the colony during Bougainville's absence. After the retrocession of the Falkland archipelago to Spain in 1766, he was sent to make an exploration of the coast of Patagonia, and visited also the island of Georgia. At the beginning of the war of 1778 he again entered the royal navy as 1st lieutenant, and was appointed harbor-master of Port Royal. He published "Histoire de la colonic fondee aux iles Malouines par le capitaine de Bougainville, suivie d'une description de la cote de la Patagonie, et d'une relation d'un voyage g File Saint Pierre et a la Terre des Etats" (Dieppe, 1768).