44 OF THE PRINCIPAL WORMS 



tioiis resemble crotchets or fangs, like the armed 

 taenia ; the head has these fangs imitating a coro- 

 net of wrinkles which serves firmly to secure the 

 papillae which opens in the centre of its head, to- 

 ward the parts of our body, and which draws its 

 nourishment at our expense. This worm is there- 

 forer a very singular animal ; it is only found iu 

 the most concealed parts of our body, that are en- 

 tirely secluded from external substances. Not the 

 slightest trace of its eggs have yet been discovered. 



May they not be developed in the interior of 

 the lymphatic vessels ?(139) 



§. XXVIII. Our vesicular worm differs from 

 those seen in the liver of hares, of mice, and in the 

 brain of sheep, though the latter resembles it very 

 nearly. 



In man, a single worm is contained in each lit- 

 tle bladder, w bile in the vesicular worms of other 

 animals, there are several small worms in each 

 vesicle. The head of the human vesicular worm 

 is without the bladder, to which it is united by its 

 neck ; in the vesicular worms of other animals, 

 these small worms live within the parietes of the 

 common bladder. 



Lastly, the small bladder of the human vesicu- 

 lar worm seems to form^ the body of the worm, 

 while in the vesicular worms of animals, it is 

 merely the common recipient to contain the worms. 



The figures of the vesicular worms of hares 

 and sheep, as given by Goeze, are very exact ; 

 they merit attention,{i40) in order to notice the 



