25 



PART III. 



Cysticerci^ &c. 



HAVING discussed the two preceding entozoa, there 

 yet remains another group to mention, viz., the Cysti- 

 cerci. The true nature of this group, and the rela- 

 tion they bore to the Taeniae, were for a long time 

 unknown; and, although the resemblance between 

 the heads of some of the Cysticerci and of the Tsenise 

 had been noticed, no practical deductions were made 

 therefrom for some time. 



Weber, in 1688, was the first who discovered the 

 similarity existing between the C. fasciolaris and the 

 tapeworms. 



In 1760, Pallas described these Cysticerci, as forms 

 of tapeworms, under the name of Taenia hydatigena. 



In 1782, Ephraim Goeze, a German clergyman, in 

 his work, " Versuch einer Naturgeschichte der Ein- 

 geweiderwiirmer," noticed the similarity between the 

 heads of the C. fasciolaris, found in the liver of the 

 mouse, and the T. crassicollis (his T. serrate) of 

 the cat, as is shown in these words (op. tit., p. 340), 

 while speaking of the T. crassicollis : 



" The size, form, and structure of its head are per- 

 fectly identical with those of the head of the articu- 

 lated cystic tapeworms in the liver of the mouse ; for 



