. Elements of zoölogy. Zoology. 44 THE WORMS. fluke-worm, F, that finally escapes through the intestine, and lays eggs in pools or ponds, thus completing the trans- formation, that varies in different genera. The tape-worm that comes from pork belongs in this Fig. 42.—A, Monostomum mutabile. A, the ciliated embryo ; a, the nurse ; b, nurse free; C, Redia of Distoma pacificutn, containing germs of other Redicz; D, Redia containing Cerca7-ice (a) ; E, Cercaria; F, Dis- toma, which results from the metamorphosis of the Cercaria. (After Steenstrup.) Class II. — Round or Thread-Worm {Nema-
. Elements of zoölogy. Zoology. 44 THE WORMS. fluke-worm, F, that finally escapes through the intestine, and lays eggs in pools or ponds, thus completing the trans- formation, that varies in different genera. The tape-worm that comes from pork belongs in this Fig. 42.—A, Monostomum mutabile. A, the ciliated embryo ; a, the nurse ; b, nurse free; C, Redia of Distoma pacificutn, containing germs of other Redicz; D, Redia containing Cerca7-ice (a) ; E, Cercaria; F, Dis- toma, which results from the metamorphosis of the Cercaria. (After Steenstrup.) Class II. — Round or Thread-Worm {Nema- tehninthes). The pin-worm and Trichina are examples. The Trichina spiralis (Fig. 43), one twelfth of an inch long, is the most dangerous, becoming encysted in the human muscles. The eggs are eaten by rats, that in turn are perhaps eaten by pigs, so finding their way into the human system. The Gordius. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
Size: 1528px × 1635px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
