Flukes. 



Trematodes or Flukes. The second order of 

 sucker-bearing parasitic worms consists of the c flukes/ 



FIG. 37- 



FIG. 



Distouia lanceo'atuni) the liver fluke. 

 a, anterior sucker ; b, posterior sucker; 

 c, digestive canal ; d, yolk-gland ; e, 

 ovary ; /, posterior terminal pore of 

 the water-vascular system ; .g, duct of 

 yolk-gland to oviduct ; h, lateral tube 

 of water-vascular system; z, /, sper- 

 matic gland ; k, spiculum. 



Oxyuris vermicnlaris, the common threadworm of children. The central 

 tube is the digestive canal, the coiled tube is the ovary. 



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

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



