Flukes. 



Trematodes or Flukes. The second order of 

 sucker-bearing parasitic worms consists of the ' flukes/ 



FIG. 37. FIG. 38. 



Dittoma lanceolatum^ the 

 liver fluke, a, mouth ; b, 

 sucker ; c, digestive canal; 

 d. e, water-vascular sys- 

 tem ; A, k t reproductive 

 organs. 



Oxyuris vermiciilaris, the common threadworm of children. 



met with in the liver of the sheep, and of allied forms 

 ( n g- 37) ; these are not united in chains as in the 



