Arnold Lang ( 18 June 1855 -- 30 November 1914 ) was a Swiss naturalist , a comparative anatomist and student of German biologist Ernst Haeckel . Arnold Lang ( June 18 , 1855 - November 30 , 1914 ) was a Swiss naturalist , a comparative anatomist and a student of the German biologist Ernst Haeckel . Arnold Arnold Lang ( June 18 , 1855 - November 30 , 1914 ) was a comparative naturalist , Swiss anatomist and student of German biologist Ernst Haeckel .