File:A monograph of the terrestrial Palaeozoic Arachnida of North America progress Page18 fig 17.png
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![File:A monograph of the terrestrial Palaeozoic Arachnida of North America progress Page18 fig 17.png](https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/A_monograph_of_the_terrestrial_Palaeozoic_Arachnida_of_North_America_progress_Page18_fig_17.png/408px-A_monograph_of_the_terrestrial_Palaeozoic_Arachnida_of_North_America_progress_Page18_fig_17.png?20181019181439)
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