Evolution of life Philadelphia, 1873, A scientific illustration depicting various types of worms, categorized into two main groups: roundworms and flatworms. The top section includes roundworms, featuring labeled specimens such as 'Trichina in sac,' 'Trichina free,' and 'Echinorhynchus.' The bottom section showcases flatworms, with illustrations of 'Planaria,' 'Distoma,' and 'Taenia tape worm,' along with other flatworm types like 'Prosthycnchus' and 'Aspidogaster.' Each worm is clearly labeled with its corresponding number for reference, providing a visual guide to the anatomy and diversity of these parasitic creatures.