Huxley, Thomas Henry (1825–1895)
Haeckel, Ernest (1834–1919)
Haeckel, Ernest (1834–1919)
Mason, Frances
Osborn, Henry Fairfield, (1857–1935)
Haeckel, Ernest (1834–1919)
Darwin, Charles Robert, (1809–1882)
Darwin, Charles Robert (1809–1882)
Haeckel, Ernest (1834–1919)
Poulton, Edward Bagnall (1856–1943)