THE LUNG FLUKE 



53 



Clonorchis sinensis (Plate VII, 

 Fig. 1) 



Length, 13 mm. to 22 mm. 



Width, 3 mm. to 4 mm. 



Parenchyma contains numer- 

 ous yellowish or brownish 

 pigment granules 



Vitellaria interrupted 



Eggs, length 26/* to 30 M by 15/x 

 to 17 p. Average size 29/i by 

 Ufci 



Distribution, China, Cochin 

 China, Formosa 



Life history unknown, prob- 

 ably very similar to that of 

 Clonorchis endemicus 



Pathogenicity. Produces se- 

 vere chronic disturbances of 

 the liver 



Clonorchis endemicus 



Length 6 mm. to 15 mm.. 

 Width 1.8 mm. to 2.6 mm. 

 Parenchyma contains no 

 ment. 



Pig- 



Vitellaria continuous 



Egg. Average size 26/z by 15ju 



Distribution Japan, Korea, 



Cochin China 

 Life history: Cercaria develops 



in redia in a small fresh water 



snail, Bythinia striatula var. 



Japonica; encysted stages are 



found in a number of species 



of fresh water fish 

 Pathogenicity. The same as in 



Clonorchis sinensis 



2. Opisthorchis felineus. Yellowish red, flat, transparent 

 fluke; length 8 mm. to 11 mm., width 1.5 mm. to 2 mm.; 

 testes lobed, obliquely one behind the other, in posterior 

 fourth of body; ovary small, slightly lobed, just in front of 

 testes; uterus fills median field between ovary and ventral 

 sucker; habitat gall bladder and bile ducts of cats, dogs, 

 fox and man; encysted stage in fresh water fish; found in 

 man not infrequently in Russia, Siberia and East Prussia. 

 Pathogenicity similar to that of Clonorchis sinensis. 



E. The Lung Fluke 



A single species of trematode, Paragonimus westermanii, 

 is found in the lungs of man; a closely related species Para- 

 gonimus kellicotti from the lungs of the pig and cat have 

 also been described from the United States. 



