EXAMINATION OF HELMINTHES 



133 



Whole specimens otOpisthorchisfelineus and Dicroctelium lanceatum 

 are prepared in a similar manner. The comparison of these with the 

 Trematodes found in frogs is very interesting because, though similar 

 in size and form, they differ very materially in their anatomy (figs. 57 

 and 58). 



The lancet-fluke has a long oesophagus and short stomach-tubes, 

 and its genital opening lies close to the ventral sucker, immediately 



behind the spot where the stomach - 

 tubes fork. In the fluke of the cat, 

 on the other hand, the genital open- 

 ing is some distance from this spot. 

 The sexual glands (the testes and 

 ovary) of the lancet-fluke are behind 

 the ventral sucker ; the large, slightly 



r 



FIG. 57. Dicroccelium lanceolatum, 

 St. et Hass. 15:1. Bs., Ventral 

 sucker. Cb., Cirrhus pouch. D., 

 Stomach-tubes. Dst., Yolk-gland. H., 

 Testes. K. t Ovary. Ms. , Oral sucker. 



FIG. 58. Opisthorchis felineus 

 (Biv.). 10:1. 



lobated testes being situated in front of the smaller ovary, which lies a 

 little to the right. In the fluke of the cat, the sexual glands are at the 

 hinder end of the body and, in this case, the ovary, which is small, is 



