CESTOIDEA. 19 



are numerously disseminated throughout the struc- 

 ture of the worm. 



Species or Varieties recognised by different 

 autJiors. 



Variety A. Cysticercus Fischerianus (Laennec). 

 — Caudal vesicle pyriform ; body attached to the 

 large end of the vesicle ; body and vesicle smaller 

 than in the cysticercus cellulosse. It has been found, 

 as well as the following variety, in the human choroid 

 plexuses. 



Variety B. Tania Albo-punctata (Treutler). — 

 The vesicle is covered in some parts with a whitish 

 substance, and possesses a sucker, and six hooks. 



Variety C. Cysticercus Dicystus (Laennec). — 

 This consists of two vesicles of unequal size, a single 

 body, nearly an inch long, and a large -sized head ; 

 the suckers form four very black spots, visible to 

 the naked eye ; the hooks are enveloped in a mass of 

 black matter. This worm has been found in the 

 interior of the human cranium. 



Variety E. Trachelocampylus (Fredault). — This 

 is a cysticercus of a modified appearance, with the 

 body retracted into the caudal vesicle. It has been 

 observed in the human brain. 



When the great changes, which take place in the 

 cysticerci as they grow older, are considered, it is 

 evident that the different species or varieties which 

 have been described are only cysticerci ui which 

 considerable alteration in size or in appearance had 

 occurred. 



Most helminthologists admit that the cysticercus 

 ceUulosse forms the scolex of the taenia soluim. It 

 exists chiefly in the muscles, in the brain, and in the 



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