34 



ally distributed over the entire body ; viz., in the liver 

 (Rudolphi, Eschricht, Lebert), the lung, the kidney, 

 the brain (Zeder), in the lachrymal gland (Smidt), and 

 in the heart (Morgagni). They have also been found 

 in the spleen (Collet), in a goitre (Albers and Boeck, by 

 Forster), in the choroid, and in the crystalline lens 

 (Geschiedt). 



Acephalocysts. 



The third group, those of Acephalocysts (PL III. 

 fig. 4), are now considered to be a barren Cysticercus 

 or Echinococcus vesicle, in opposition to the former 

 belief, that they were a separate species of Helminth, 

 or that they were not of an independent animal or- 

 ganization. 



They are vascular, of a spherical shape, of simple 

 structure, non-adherent to the tissues, and containing 

 within them other vesicles, attached to the inner wall 

 of the external vesicle or to each other. The walls 

 are gelatiniform, elastic, and tremble, when touched, 

 like a jelly. This vesicle contains a watery fluid, or a 

 substance which has a purulent consistence, and con- 

 tains the microscopic elements of calcifying embryos, 

 or of encysted proteine masses in the act of resorption 

 (Kiichenmeister). Within the secondary cysts are, 

 according to Kiichenmeister, no solices of cestoidea or 

 their remains to be found : but Van Beneden, of Bel- 

 gium, does not agree to this ; for he states that it is 

 not rare to find sacs containing at the same time inert 

 vesicles, and embryos provided with their hooks, 

 which consequently pertain to the nature of Aceph- 



