Slide showing engraving of 'Trichina spiralis'. Slide shows black and white engraving of 'Trichina spiralis'. Diagram shows five individual images, and the slide's label reads: 'Fig 286 - Trichina spiralis. a - mature female Trichina spiralis from the alimentary canal. G - genital opening. e - embryos. ov - ovary. b - male. T - testis. c - embryos. d - embryo which has migrated into muscle fibre, already considerably enlarged. e - the same developed into a coiled Muscle Trichina spiralis and in encysted.' Small round sticker in upper left corner '15'. Number '32' written on tape on top edge of slide. Late 19th - early 20th century