. Comparative anatomy and physiology. 548 COMPARATIVE ANATOMY AND PHYSIOLOGY. position at the roots of the grass, and so on, and in time either die down, or are eaten by a sheep. When the latter misfortune happens, they pass into the stomach, and so to the gall ducts and liver, to grow up afresh into the likeness of the liver-fluke from which they started. Histories not unlike those of these two divisions of the Platy- helnrinthes are presented by the round - worms or IVematoiiel- miiitlies, and by the Echino- rliynclii. The thread - worm of the human blood (Filaria sanguinis hominis), which a
. Comparative anatomy and physiology. 548 COMPARATIVE ANATOMY AND PHYSIOLOGY. position at the roots of the grass, and so on, and in time either die down, or are eaten by a sheep. When the latter misfortune happens, they pass into the stomach, and so to the gall ducts and liver, to grow up afresh into the likeness of the liver-fluke from which they started. Histories not unlike those of these two divisions of the Platy- helnrinthes are presented by the round - worms or IVematoiiel- miiitlies, and by the Echino- rliynclii. The thread - worm of the human blood (Filaria sanguinis hominis), which appears to be the cause of chyluria and of some other diseases in the countries of the Eastern Old World, has been found to have an intermediate host in the mosquito, from whom it passes into water; when this water is drunk the young return to the human intestine. Dracunculus mediiiensis lives in its adult con- dition in the subcutaneous tissue of the human leg and foot : its larval stages being passed, as it (After seems, in a fresh-water crustacean. Trichina is an example of a form which appears to have had its history modified ; in societies that may be called cannibal ( rats) no in- termediate host would appear to be necessary ; in the case of civilised man, the adult worms are obtained from the flesh of incompletely-cooked Fig. 229.—Cefcaria o/ D hepaticum. Thomaa.). 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 Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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