nautilus: The Paper Nautilus or argonaut is a small cibranchiate cephalopod. The female is protected by a thin, single-chambered shell and has webbed dorsal arms which it was once believed were used for sails. The Pearly Nautilus is a tetrabranchiate cephalopod found in the Pacific and Indian oceans.
ART. IV. A Journal of the Voyages and Travels of a Corps of Discovery, under the Command of Captains Lewis and Clarke, from the Mouth of the River Missouri, through the interior Parts of North America, to the Pacific Ocean. By Patrick Gass, one of the Persons employed on the Expedition, pp. 381. 8vo. Pittsburgh, printed. London, re-printed. Budd. 1808