LESSON 29.] 



THE ORGANS OF NUTRITION. 



101 



skull, and remove the upper part, so as to expose the brain ; an ani- 

 mal, like the figure given, will be invariably found. 



Many Cystoid animals there are closely allied to the Coenurus, 

 and afflicting alike domestic animals, and man, but their effects are 

 not immediately fatal. 



504. The Echinococcus hominis, is a small animal cell, provided 

 at its summit with a remarkable circlet, or coronet of teeth, by which 

 it clings to the tissue, and four suctorial mouths for the imbibition 

 of nutriment ; they have been found in the liver and other organs of 

 the human body (Fig. 172) ; a, head ; b, suckers. 



505. Another cellular animal (Cysticercus cellulosa) has been 

 met with in the eye, brain, substance of the heart, and the voluntary 

 muscles of the body (Fig. 173) ; in addition to the head, formed 

 like the last, this animal possesses a 



long neck, which terminates in the nu- 

 trimental sac. The head, with its 

 coronet of spines, a/ the digestive 

 sac, b. 



A magnified view of the coronet 

 of spines is given in Fig. 174 ; b, the 

 spines, or teeth ; a, the suctorial mouths. 



506. These animals infest Pigs to an enormous extent, causing 

 what is called the measles ; and as the vitality of the ova is not de- 

 stroyed in the process of cooking, those persons who eat fresh pork 



PIG. 172. 



FIG. 173. 



Echinococcus he- 

 minis. 



Cysticercus cel- 

 lulosa. 



FIG. 174. 



Head of Cysticercus, magnified. 



(not salted) need not be surprised to find themselves the victims of 

 507. TcBnia solium, or tape worm, of which it is now well known 



