Manual of pathological anatomy . 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
Manual of pathological anatomy . 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. A, Echinococcus, the head retracted; b, echinococcus, the head and coronet of hooksfacing the observer; c, echinococcus, the head extruded; d, section of wall of aoe-phalocyst, with blastematous layer, in which are seen several echinococci. manner. It is in the substance of the endocyst, whether of theprimary or subsequently formed cavities that the scolices, whichbecome the heads of the adult tsenise, arise, but by a somewhatindirect process. Small granulations arise in the endocyst, whichfor a certain time grow as if about to form scolicea or echinococcusheads directly; but stopping short at a certain stage of develop-ment, enlarge and become converted into brood capsules, orcavities containing a portion of endocystic or parenchymatousmembrane; in which a number of scolices are produced. Thesebrood capsules are described as being of the size of a millet seed :they are peculiar to and characteristic of the development of the 220 CESTOID PARASITES. echinococcus. The origin of the seco
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