Image from: Shephard, Benjamin. Challenger Sketchbook: B. Shephard's Sketchbook of the H. M. S. Challenger Expedition, 1872-1874. Edited by Harris B. Stewart and J. Welles Henderson. [Philadelphia]: Philadelphia Maritime Museum; distributed by the New York Graphic Society, Greenwich, Conn., 1972. Photographed from the collection of Mann Library. (Also available online at https://photolib.noaa.gov/Collections/Voyage/Other/emodule/1340/eitem/78657)