Keywords: Schmidt Miscellanea Silurica III Fig. 5.jpg Friedrich Schmidt Miscellanea Silurica III In MĂ©moires de l ™AcadĂ©mie ImpĂ©riale des Sciences de St -PĂ©tersbourg 7 Serie Band 31 1883 Nr 5 Fig 5 http //babel hathitrust org/cgi/pt id mdp 39015038700368;seq 152 Michigan/Google 1883 Friedrich Schmidt PD-old Friedrich Schmidt |