82 ON THK SCOLEX OF A CESTODE. 



the outside but reinforced by thicker bars. When the walls of 

 the bothrium are closed upon each other there is absolute contact 

 between the cuticular layers of the two sides. The appearance is 

 totally different from what is to be seen in Solenophorus, and thus 

 presents a striking difference between the two genera. It should 

 be added that in Diitkiersia, as in Solenophorus, a second layer 

 lies within the outer cuticular layer just described which is 

 precisely like that of Solenojjhorus. 



