William Dougal (1822–1895) of Washington, D.C. engraved this print of fish species, "Arius equestris [B&G]," after an original sketch by John H. Richard (c.1807–1881) of Philadelphia. The engraving was printed as Plate 15 in “Ichthyology of the Boundary” by Charles Girard (1822-1895), published in Volume 2, Part 2 of the Report on the United States and Mexican Boundary Survey. The volume was printed in 1859 by Cornelius Wendell of Washington, D.C.
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