. A textbook in general zoology. Zoology. 66 FLATWORMS, ROUNDWORMS, AND ROTIFERS out of the body Fig. 31.—Rediaform of fluLeworm as it appears in the body of the snail, show- ing eercarise. After Fig. 33. — Head of tapeworm showing suckers and hooks. Greatly enlarged. of the snail, crawls up the stem of a plant or blade of grass and secretes about itself a cyst or hard film of gela- tinelike substance. In these situations it is eaten by the grazing sheep. In the stomach of the sheep the cyst is dis- solved, and the imma- ture worm soon works its way to the Uver, where it grows and b
. A textbook in general zoology. Zoology. 66 FLATWORMS, ROUNDWORMS, AND ROTIFERS out of the body Fig. 31.—Rediaform of fluLeworm as it appears in the body of the snail, show- ing eercarise. After Fig. 33. — Head of tapeworm showing suckers and hooks. Greatly enlarged. of the snail, crawls up the stem of a plant or blade of grass and secretes about itself a cyst or hard film of gela- tinelike substance. In these situations it is eaten by the grazing sheep. In the stomach of the sheep the cyst is dis- solved, and the imma- ture worm soon works its way to the Uver, where it grows and be- comes mature, thus com- pleting the life history. Tapeworm. ^ There are several species of tapeworms, all of which are parasitic in their adult stages, in the bodies of vertebrates, as, man, cattle, dog, sheep, birds, fishes, etc. At Fig least three different spe- cies are fairly common as parasites in the in- testines of man, but we shall speak of only one here, namely, the pork tapeworm.* Like the flukeworm, the tapewordi passes the larval stage of its life history in one animal and the adult stage in 32. — Cercaria form of flukeworm. In this form it escapes from the snail's body, climbs ablade of grass, and becomes encysted. After Leuckart. ' Dr. Charles Wardell Stiles says that the pork tapeworm is comparar tively rare in this country, and that the beef tapeworm is the most common one here. Bull. 19, U. S. Dept. Agri. B. A. I., 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 Herrick, Glenn W. (Glenn Washington), 1870-1965. New York, Cincinnati [etc. ] American Book Company
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