Diseases of metabolism and of Diseases of metabolism and of the blood, animal parasites, toxicology diseasesofmetabo00cabo Year: 1906 CESTODES 515 ova, the shells of which are radially striated, enclose the oncosphere which is supplied with six hooklets. Malformations arc rarer than in the tenia saginata. I wish to mention only the three-edged or prismatic tenia which is produced, not as was fre- quently assumed from a twelve-hooked oncosphere, but by tin1 coalescence of two scolices with one-half of their dorsal surfaces, whereas the other two halves remain free; it appears that the dorsal
Diseases of metabolism and of Diseases of metabolism and of the blood, animal parasites, toxicology diseasesofmetabo00cabo Year: 1906 CESTODES 515 ova, the shells of which are radially striated, enclose the oncosphere which is supplied with six hooklets. Malformations arc rarer than in the tenia saginata. I wish to mention only the three-edged or prismatic tenia which is produced, not as was fre- quently assumed from a twelve-hooked oncosphere, but by tin1 coalescence of two scolices with one-half of their dorsal surfaces, whereas the other two halves remain free; it appears that the dorsal parts of the coalescent halves are at the same time greatly retarded in growth. The asexual immature form is the Cysticercus cellulosae, the firm of swine, which is found principally in the pig, but also in other mammals. The mode of infection of the pig and of man is well known. The Cysticercus cellulosae occasionally also -how- malformations. Such are the Cysticercus (tenia) acanthotrias Weinland and the Cysticercus race- mosus which is formed like a hunch of grapes and possesses many branches; the latter is found in the brain and in the heart. This upsets (according to the views of Redon, Blanchard, Raillet and Braun) the hypothesis of a >pecial genus of tenia (Cysticercus) acanthotrias. The second variety, the tenia saginata, is more rounded and larger than the tenia solium, and has the following characteristics: The head is larger, the row of hooklets and the rostellum are ahsent ; the suctorial discs are markedly developed. The proglottides are supplied with irregularly alter- Fig. 36.—Ova of Tenia Solum. Fig. 37.—Ova of Tenia Saginata. The enlargement is the same in Fig. 36 and Fig. 37. nating sexual papillae; they -how a uterus with 20 to 30 ot even more lateral branches; the Bexually mature members which are cast oil' spontaneously are frequently found without ova, because the latter have been discharged prema- turely owing to a Lesion of the uterus. The ova
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