. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. PORK TAPEWORM 241 likely to occur. The infrequence of these tapeworms in the Philippines where the bladderworms are very common in hogs is worthy of note. The adult Tcenia solium differs from the beef tapeworm chiefly in the form of the scolex, which in addition to four suckers is armed with a double row of hooks, arranged on a conical pro- jection or " rostellum " at its apex (Fig. 82B). The worms are usually of less length than beef tapeworms, seldom exceeding from six to ten feet; they cons
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. PORK TAPEWORM 241 likely to occur. The infrequence of these tapeworms in the Philippines where the bladderworms are very common in hogs is worthy of note. The adult Tcenia solium differs from the beef tapeworm chiefly in the form of the scolex, which in addition to four suckers is armed with a double row of hooks, arranged on a conical pro- jection or " rostellum " at its apex (Fig. 82B). The worms are usually of less length than beef tapeworms, seldom exceeding from six to ten feet; they consist of about 800 or 900 segments. The ripe proglottids (Fig. 84B) can in most cases be distinguished from those of the beef tapeworm by their usually smaller size and fewer branches of the uterus (compare Figs. 84A and'B). The eggs, passed in the ripe proglottids with the faeces, develop into bladderworms when eaten by hogs or cer- tain other animals. The usual filthy way in which hogs are housed and fed gives ample opportunity for infection if the infested people are at all careless in their personal habits, or if privies are built so that they leak and the hogs have access to the surrounding ground or outflowing streams. Young pigs are especially likely to become " measly " from eating tape- worm eggs. As soon as the eggs reach the intestine pj^ gg Fragment the six-hooked embryos are liberated from of measly pork. (After the enclosing capsule and make their way through the wall of the intestine, to be carried by bloodvessels to the place where they are to develop. They may develop in almost any or all of the muscles or organs of the hog's body, but they especially favor the tongue, neck and shoulder muscles, and, next in order, certain muscles of the hams. Sometimes the bladderworms, technically known as Cysticercus cellulosce, be- come so numerous as to occupy over one-half of the total volume of a piece of flesh examined, , several thousand to a pound. They ap
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