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Jellyfish. Deep sea medusae. By Ernst Haeckel and A. Giltsch.
From Vol. 4, pt.11-13 of Report on the scientific results of the voyage of /i>H.M.S. Challenger during the years 1873-76 under the command of Captain George S. Nares … and the late Captain Frank Tourle Thomson, R.N., published in 1882.