Slide showing diagrammatic engraving of 'Tetrarhynchus reptans' in sunfish. Slide shows 9 individual engravings illustrating worms found in a sunfish. Labels corresponding to each image reads, 'Fig. - Tetrarhynchus reptans. 1. Reduced figure of a sunfish showing the worms in situ; 2. head of a worm in its capsule; 3. taenioid scolex; 4. section of the immature strobile; 5. proboscis; 6. row of hooks; 7, 8. large and small hooks (magnified 260 diameters); 9. head of the scolex viewed from above. Original.' Labelled at top of slide 'Parasites and their hosts'. Small round sticker on upper right '32'. Label at upper right corner, 'Laurie, London'. Late 19th - early 20th century