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Various shell specimensWhelk, Buccinum undatum 1, Noahs ark, Arca noae 2, noble pen shell, Pinna nobilis 3, Tusus brevis 4, Caltrop murex, Murex tribulus 5, Admiral cone, Conus admiralis 6, volute, Voluta arenata 7
Water caltrop or buffalo nut, Trapa natans, Macre. Handcoloured steel engraving by Oudet after a botanical illustration by Edouard Maubert from Pierre Oscar Reveil, A. Dupuis, Fr
German trench defences, WW1 1915Example of a German trench defences employed in World War One: caltrops, chevaux des frise, shields, barbed wire and deep dug outs(some as much as 25 to 30 feet below the surface). Date: 1915
