Manual of pathological anatomy . er complications are not unknown. All these derived cystsresemble the parent in having a whitish semi-transparent wall,composed of a laminated edocyst and parenchymatous endocyst; butthey are of course without the external adventitious coveringderived from the surrounding tissues. They also contain the samewatery fluid. ^ The structures formed by endogenous multiplica-tion have received the names of Echinococcus hominis, E. altrici-pariens, E. endogenus, E. hydatidosus, &c. In the exogenousmode of development the original cyst remains simple, thoughothers may b
Manual of pathological anatomy . er complications are not unknown. All these derived cystsresemble the parent in having a whitish semi-transparent wall,composed of a laminated edocyst and parenchymatous endocyst; butthey are of course without the external adventitious coveringderived from the surrounding tissues. They also contain the samewatery fluid. ^ The structures formed by endogenous multiplica-tion have received the names of Echinococcus hominis, E. altrici-pariens, E. endogenus, E. hydatidosus, &c. In the exogenousmode of development the original cyst remains simple, thoughothers may be formed on the outside. The forms thus producedare seen commonly in certain of the lower animals, as swine»monkeys, sheep, &c., but very rarely in man; and being thusprevalent when the forms are rare or absent, and being strikinglydifferent in appearance, were formerly described as a distinctspecies under the names of Echinococcus exogenus, E. yeterinorum,E. granulosus, E. scolicipariens; till the identity of the forms. Taenia echinococcns from the dog. A, genital orifice. (After Cobbold.) CESTOID PABASITEg. 219 denominated by these numerous synonyms was shown by demon-strating the origin of all from tsenia echinococcus. The formcalled echinococcus multilocularis has been observed only in man,and nowhere except in the liver. It may reach a considerable size,forming a tumour as large as a childs head, but contains no con-siderable cyst, being made up of an enormous number of minutecavities with gelatinous contents, so as greatly to resemble analveolar colloid cancer, for which indeed the structure has beenmistaken. It is particularly liable to central ulceration andsoftening. (Yirchow.) Production of Scolices.—In the two first-mentioned forms thegrowth of the echinococcus takes place in substantially the same Fig. 52.
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