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Worms: 1) Trichinella in muscle tissue; 2) Larva of the liver fluke (Fasciola hepatica); 3) Liver fluke (Fasciola hepatica);; 4) Head and segment of the tapeworm (Eucestoda); 5) Cysticercus - scientific name given to the young tapeworms (larvae) belonging to the genus Taenia; 6) Detached scolex (four-sided knob, armed with suckers or hooks or both) of Coenurus cerebralis - a larval stage of intestinal tapeworm Taenia Multiceps; 7) Dog tapeworm (Echinococcus granulosus) from pig (brood capsule); 8) Detached scolex of dog tapeworm (Echinococcus granulosus); 9) Head and segments of the fish tapeworm (Diphyllobothrium latum); 10) Opened leech (Hirudo medicinalis); 11) Nervous system of the leech. Wood engravings, published ca. 1890.