. Diseases of metabolism and of the blood, animal parasites, toxicology. Constitutional diseases; Metabolism; Blood; Medical parasitology; Poisons. 520 THE ANIMAL PARASITES OF MAN eially in the cyclops serrulatus, Fischer, and diaptomus spinosus, Daday; and since these are frequently found in stagnant waters, the occurrence of the parasite in geese and ducks is quite natural. The crabs, which are often difSeult to recognize, occasionally mi- grate with the drinking-water into the intestiaal canal of man; the cercocyst inhabiting the crabs develops into hy- menolepis I V r Fig. 46.
. Diseases of metabolism and of the blood, animal parasites, toxicology. Constitutional diseases; Metabolism; Blood; Medical parasitology; Poisons. 520 THE ANIMAL PARASITES OF MAN eially in the cyclops serrulatus, Fischer, and diaptomus spinosus, Daday; and since these are frequently found in stagnant waters, the occurrence of the parasite in geese and ducks is quite natural. The crabs, which are often difSeult to recognize, occasionally mi- grate with the drinking-water into the intestiaal canal of man; the cercocyst inhabiting the crabs develops into hy- menolepis I V r Fig. 46. — Htmeno- LEPis Lanceolata, Bi-ocH. Enlarged about twentytimes. Fig. 47. — Head, Greatly En- larged. Fig. 48.—Proglottid of Htmenolepis. This preparation I owe to the kindness of Pro- fessor W. Miiller of Greifswald. The most familiar of the bothrioeephali is the Bothriocephalus latus, Bremser, 1819. This broad bothriocephalus, called also the pit-head, measures 5-9 meters and is the longest tape-worm of man. The club-shaped head shows on its lateral border on each side an elongated, slit-like pit. The individual pro- glottides, 3,000 to 4,200 in number, are remarkably broad in proportion to their length. A grayish-blue centerpiece of rosette-like form bordered by two narrower bands is distinctly visible upon both surfaces. On the ventral surface are the male sexual opening and the mouth of the vagina. The mature ova are ovoid in form and surrounded by a brownish shell with a lid. The ova are rarely found in the last mature segments of the chain. Large numbers of proglottides are often expelled at once. They are voided with the feces, having been previously discharged from the uterus. If the ova reach the water, ciliated embryos develop within them, which slip from the shell of the ova and float for some time in the water. The ciliated covering perhaps seeks the intermediary host, which, as we learn from Braun's brilliant investi- gations, was found to be the pike (esox
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