This engraved printing plate was prepared to print an image showing three species of shark in the never published Volume 21-22, Ichthyology, part of the series of publications the "United States Exploring Expedition, During the Years 1838, 1839, 1840, 1841, 1842." The plate images were engraved by W. H. Dougal after Joseph Drayton.
William H. Dougal (1822–1895) of New York and Washington, D.C., (after 1844) engraved this copper printing plate depicting three species of shark documented by the U.S. Exploring Expedition. The engraved illustrations were to be published in volumes XXII and XXIII, Ichthyology, by Louis Agassiz. Dougal engraved 26 of the 28 plates for this volume which was never printed.
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