This engraved wood block was used to print an image in the publication "United States Exploring Expedition, During the Years 1838, 1839, 1840, 1841, 1842, Zoophytes," 1846, Volume 7, Chapter 4, "Actinoidea," page 54, figure 22, spiculae in Alcyonaria. The image was drawn by Joseph Drayton and was engraved by an unknown artist. It was originally printed by C. Sherman of Philadelphia.