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History of the Expedition Under the Command of Lewis and Clark: To the Sources of the Missouri River, Thence Across the Rocky Mountains and Down the Columbia River to the Pacific Ocean, Performed During the Years 1804-5-6, by Order of the Government of the United States
XXIII.—Descriptions of two new species of Nudibranchiate Mollusca, one of them forming the type of a new genus. With the anatomy of the genus, by Albany Hancock