NEW CESTODES FROM THE TASMANIAN DEVIL. 



679 



When the piece of gut to which the worms are attached is turned 

 over they reappea.r on the outer surface (as is shown in text- 

 fig. 92) in the form of a cyst. This cyst forms a simple hemi- 

 spherical bulging upon the wall of the gut consisting apparently 

 of the peritoneum. When this peritoneal wall is cut through a 



Text-fig. 94. 



Transverse section through scolex of D. rohvsta at about the middle. 

 The central medulla shows the problematical vesicles referred to in the text in 



the middle of its extent and the coils of the water-tubes at the ends. 



r. Irregular furrows upon scolex. t. Tube formed bj^ these. 



A second tube of the same nature lies above and to the right of that lettered. 



cavity is opened up in which lies the large scolex. This is 

 illustrated in text-fig. 93. The scolex, it will be observed, does 

 not completely fill the cavity in which it lies. 



