. A manual of zoology. 144 MANUAL OF ZOOLOGY a small animal, such as a water-flea, this may take place "accidentally"; in other cases the intermediate host actually forms the food of the final host. Thus, to give two instances, a Cysticercoid having as an intermediate host an earth-worm is taken with the latter into the enteric canal of a sea-gull — its final host; a Cysticercus which occurs in the liver of rats and mice is received into the enteric canal of the cat. In this way the Cysticercus or Cysticercoid is set free in the enteric canal of the final host; the tape-worm head bec
. A manual of zoology. 144 MANUAL OF ZOOLOGY a small animal, such as a water-flea, this may take place "accidentally"; in other cases the intermediate host actually forms the food of the final host. Thus, to give two instances, a Cysticercoid having as an intermediate host an earth-worm is taken with the latter into the enteric canal of a sea-gull — its final host; a Cysticercus which occurs in the liver of rats and mice is received into the enteric canal of the cat. In this way the Cysticercus or Cysticercoid is set free in the enteric canal of the final host; the tape-worm head becomes attached by means of its hooks and suckers to the wall of the intestine, and the long segmented body of the tape-worm is developed Fig. 78.—Cyst of Taenia echinoCOCCUS with the developing daughter-cyst and scolices. (After Leuckart. ) The commonest human Cestode parasites in the United States and Canada are Tcenia solium and T. saginata (T. mediocanettata), the latter being the more common pest. The Cysticercus stage of the former occurs chiefly in the flesh of the pig; that of the latter in the flesh of the ox; and the relative prevalence of these two tape-worms in different countries varies with the habits of the people with regard to flesh-eating: where more swine's flesh is eaten in an imperfectly cooked state Tania solium is the more prevalent, where more beef, T. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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