OF THE HUMAN BODY. 23 



In the cabinet of the University, one is pre- 

 served exceeding the length of seventy metres. 



§ YI. This worm is divided into head, neck, 

 body and tail. 



The head is sometimes so small, that It cannot 

 be distinguished without the microscope. It re- 

 sembles a small tubercle,(14) which rises on the 

 anterior extremity of its body, called neck.(iri) 



It is furnished with four apertures,(l6) which are 

 eminences in some worms and depressions in olh- 

 crs. From each of these four openings proceeds a 

 canal for nourishment, which extends to all the ar- 

 ticulations. 



Block has remarked that the head of some tae- 

 niae is armed with a sort of tube, which it can elon- 

 gate or retract.( 17) If we examine very careful- 

 ly the head of the taenia of man and of animals, 

 we shall see in some of them very small hooks ;(t8) 

 if these are viewed with the microscope, they are 

 seen to be arranged in form of a double crown ;(19) 

 while others inspected with the same instrument are 

 found to be quite destitute of this peculiarity, and 

 appear on the contrary to be furnished with a mouth 

 and a number of filaments all around the neck. ( 0) 

 The neck is formed by the assemblage of small 

 articulations which become broader, longer and 

 larger as they approach the body of the worm. 

 It may be said that in this way, tlie joints of the 

 taenia diminish in size as they recede from the cen- 

 tre to either extremity of the animal. (21) I regard 

 this fact as very important information, since the 



