The practice of pediatrics . saginata cattle are the intermediatehosts; for the bothriocephalic latus fish. It is possible that man himself, taking the ova of any of these wormsinto the stomach, may become the intermediary host—i.e., lodge thelarval form. This is known to happen in the case of taenia solium, theencysted larva? of which, the cysticercus cellulosa?, are sometimes foundin human muscle, the brain, etc. Taenia Saginata or Mcdiocanellata.—This is the most common tape-worm in Europe and this country. Infection occurs through eatingmeasly beef. The length of the parasite varies from 4

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The practice of pediatrics . saginata cattle are the intermediatehosts; for the bothriocephalic latus fish. It is possible that man himself, taking the ova of any of these wormsinto the stomach, may become the intermediary host—i.e., lodge thelarval form. This is known to happen in the case of taenia solium, theencysted larva? of which, the cysticercus cellulosa?, are sometimes foundin human muscle, the brain, etc. Taenia Saginata or Mcdiocanellata.—This is the most common tape-worm in Europe and this country. Infection occurs through eatingmeasly beef. The length of the parasite varies from 4 to S metres 312 DISEASES OF THE ALIMENTARY TRACT (15 to 30 feet). The head is surrounded by four pigmented suckeis, The individual segments are quite thick and opaque, and diminishin size toward the head, the largest measuring 2 to 3 cm. Eachsegment contains a many branched (20) uterus. The ova arc slightlyoval, or round, are yellowish brown in color, have a thick capsule, andmeasure 30 to 40 x 25 to 35 microns. Fig. 57. Taenia ^giuala : a, natural size; b, much enlarged; c, ova much enlarged. (Simon.) Taenia solium is shorter than the taenia saginata, measuring from2 to 3 metres, as a rule, rarely reaching a length of 6 to 8 metres. Thehead is very small, is provided with four suckers, and with a rostellnmarmed with a double row of hooklets, twenty-four to twenty-six innumber.The mature segments measure from 1 to 1.5 cm. in length, 0 to 7 mm.in breadth, and contain a uterus with only five to seven branches. Theova are round, of a brownish color, are surrounded with a thick, radially INTESTINAL PARASITES 313 streaked membrane, and in their interior the hooklets of the embryocan usually be made out. Their diameter is 30 to 35 microns. Theycan hardly be distinguished from the ova of the saginata. The lifecvcle of the taenia solium is the same as that of taenia saginata exceptthat the hog is the intermediary host. Fig. 58