Slide showing 'Mouth-parts of Phalangium'. Slide shows engraving of simple diagram of the 'Mouth-parts of Phalangium'. Label coresponding to diagram reads, 'Fig. 231 - Mouth-parts of Phalangium'. A,B,C, Gnathobases of pedipalp and first and second legs; ch, chelicera; ep, epistome; lab, labium; m, mouth; ped, pedipalp; pre.ep, pre-epistome; st, sternum; shown by the removal of the anterior part of the genital process, which extends to the dotted line; 1,2,3,4, legs.' Late 19th - early 20th century