Lamellate book-gills in a late Ordovician eurypterid from the Soom Shale, South Africa: support for a eurypterid-scorpion clade Braddy, Simon J. ; Aldridge, Richard J. ; Gabbott, Sarah E. ; Theron, Johannes N. Abstract Publication: Lethaia Pub Date: March 1999 DOI: 10.1111/j.1502-3931.1999.tb00582.x Bibcode: 1999Letha..32...72B