232 



ZOOLOGY 



SECT. 



wall of the intestine is slight and temporary ; it is effected by 

 certain organs of adhesion, the hooks and suckers on the head. 



The head (Fig. 181) maybe roughly described as pear-shaped, but 

 becomes four-sided at the broader end. In the middle of this 



S. 1^0. Taenia solium. Entire- specimen, reduced ; "/<. hc.-id. (After Leuekart.) 



broader, anterior end is a rounded prominence, the rostellum, round 

 the base of which there is a double row of usually about twenty-eight 

 curved and pointed chitinous hooks. The rostellum is capable of 

 being protruded and retracted to a slight extent, and the position 



