Flatworms and Threadworms 



293 



Opisthorchis (Distoma) felineus is common in cats. It has been 

 found in Prussia, Siberia, and Nebraska. 



Opisthorchis noverca (Distomum conjunctum) is the Indian liver- 

 fluke. 



Fig. 182. Infective Trematodes. 



I. Opisthorchis felineus. Os., oral sucker; Ph., pharynx; /., 

 intestine; Vs., ventral sucker; ut., uterus; Vg., vitelline glands; 

 Vd., vitelline duct; O., ovary; T., testes; Ec, excretory canal. 



II. Opisthorchis noverca. A., greatly enlarged. B., almost na- 

 tural size, m., mouth (oral sucker); ph., pharynx; ac, acetabulum 

 (ventral sucker); ut., uterus; vt., vitelline glands; ov., ovary; vd., 

 vas deferens; t., testes; i., intestine; ex p., excretory pore. 



III. Fasciolopsis buski. 



IV. Heterophyes hcteropliyes. a., schematic and highly en- 

 larged; b., about twice natural size; e., eggs, greatly magnified; 

 d., spine greatly magnified. (I, after Stiles and Hassal; II, after 

 Manson; III, after Rivas; IV, after Loose.) 



V. Paragonimus W ester mani (Asiatic Lung Fluke): 1, oral 

 sucker; 4, intestine; 7, acetabulum; 8, ovary; 9, excretory canal; 

 11, yolkglands; 12, testis; 14, uterus. (After Pratt.) 



Opisthorchis (Distoma) sinensis. This is one of the most important 

 of liver-flukes. It occurs extensively in Japan, China, and India. It is 

 from 10 to 20 mm. long and from 2 to 5 mm. broad. The eggs are oval 



