Archiv für Naturgeschichte (Nicolai, 1899)

Bulletin - United States National Museum (G.P.O, 1910)

Bulletin - United States National Museum (G.P.O, 1968)

Catalogue of the British echinoderms in the British Museum (Natural History) - Bell, F. J. (Francis Jeffrey), 1855 -1924 (Printed by Order of the Trustees, 1892)

Catalogue of the British echinoderms in the British Museum (Natural History) - Bell, F. J. (Francis Jeffrey), 1855 -1924 (Printed by Order of the Trustees, 1892)

The Danish Ingolf-Expedition - Wandel, C. F. 1843 -1930 (H. Hagerup, 1899)

The Danish Ingolf-Expedition - Ingolf (Cruiser) (H. Hagerup, 1907)

The Danish Ingolf-Expedition - Ingolf (Cruiser) (H. Hagerup, 1903)

Echinoidea Pt. I-II - Mortensen, Theodor, 1868 -1952 (Printed by Bianco Luno, 1903)

International catalogue of scientific literature - Royal Society (Great Britain) (Published for the International Council by the Royal Society of London, 1908)

A manual of the common invertebrate animals, exclusive of insects - Pratt, Henry Sherring, 1859 - (A.C. McClurg & Co, 1923)

A manual of the common invertebrate animals, exclusive of insects - Pratt, Henry Sherring, 1859 - (A.C. McClurg & co, 1916)

Report on the scientific results of the voyage of 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 - Thomson, C. Wyville, Sir, (Charles Wyville), 1830 -1882 (Neill, 1881)

Report on the scientific results of the voyage of 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 - Thomson, C. Wyville, Sir, (Charles Wyville), 1830 -1882 (Neill, 1881)

Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899 - Chun, Carl, 1852 -1914 (G. Fischer, 1906)

Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899 - Chun, Carl, 1852 -1914 (G. Fischer, 1906)

Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899 - Chun, Carl, 1852 -1914 (G. Fischer, 1906)

Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899 - Chun, Carl, 1852 -1914 (G. Fischer, 1906)