Slide showing coloured diagram of cross-section(?) of bladder worm. Slide shows coloured diagram of the cross section (?) of a bladder worm. Written on tape on top edge, 'Diagram of ...(undescipherable) Bladder worm (coenuxus)(?). Two small round stickers on upper left and right of slide frame - '9' and '57'. Small round sticker on outside of glass on back '115(?)'. Late 19th - early 20th century