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Keywords: Origin of Vertebrates Fig 077.png Fig 77 ”Operculum and Following Segments Of Male Thelyphonus Opercular segment is marked out by thick black line Ut Masc uterus masculinus; Int Op internal opening of uterus into genital chamber; Ext Op common external opening to genital chamber Gen Ch and pulmonary chamber 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Thelyphonus |