Diseases of swine, with particluar reference to hog-cholera . nin, or santonin and areca nut, following much the same direc-tions as in the case of the treatment for Ascaris suilla. THORN-HEADED WORM (ECHINORHYNCHUS GIGAS)This parasite is a very common one in the United States. Itis a worm which is found only in the hog, no other species of animalharboring the parasite. The thorn-headed worm is so-called onaccount of the fact that the biting apparatus of the head is armedon either side with five or six spine-like thorns, by which the wormis enabled to attach itself firmly to the lining membran
Diseases of swine, with particluar reference to hog-cholera . nin, or santonin and areca nut, following much the same direc-tions as in the case of the treatment for Ascaris suilla. THORN-HEADED WORM (ECHINORHYNCHUS GIGAS)This parasite is a very common one in the United States. Itis a worm which is found only in the hog, no other species of animalharboring the parasite. The thorn-headed worm is so-called onaccount of the fact that the biting apparatus of the head is armedon either side with five or six spine-like thorns, by which the wormis enabled to attach itself firmly to the lining membrane of thebowel. It is often found in the small intestine of the hog, lessfrequently also in the large bowel. The echinorhynchus is oftenfound in association with the common round-worm, but can beeasily distinguished from this parasite. While the round-wormsare often found in large numbers, it is unusual to find more than ahalf-dozen of the thorn-headed worms in a single animal. Description.—The Echinorhynchus gigas is, as the name im- THORN-HEADED WORM 663. plies, a large worm. The female often reaches a length of 8 to 12inches; the male, 3 to 4 inches. The fully developed wormis about as large around as a good-sized lead-pencil at its anteriorextremity, and tapers somewhat posteriorly. At the posteriorend the female parasite is only about as large as an ordinary knit-ting needle. The male parasite does not taper as markedly as thefemale. This worm is of a milky white color, and shows on thesurface of the body a number oftransverse ridges. At the anterior extremity of theworm there is a very abrupt taper-ing off to form the head. This headis armed with a powerful bitingstylet or proboscis, by means ofwhich the worms attach each side of this proboscis is abristling row of small hooklets whichunder a large reading glass veryclosely resemble the claws of a parasite has no digestive ap-paratus as in the case of the round-worm, but absorbs its food from thedi
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1914
