196 



FLAT WORMS. 



23 times in man, and in these instances does not seem to have occa- 

 sioned marked symptoms. There is, however, a possible importance 

 of F. hepatica in connection with a peculiar affection known as 

 "halzoun." This results from the eating of raw goats' liver, and it is 

 supposed that the 'flukes crawl up from the stomach and, entering the 



5. 



FIG. 61. Trematodes of man, natural size, i, Oonorchis endemicus (Opisthor- 

 chis sinensis) ; 2, Gastrodiscus hominis; 3, Dicrocoelium lanceatum; 4, Hetcrophyes 

 heterophyes; 5, Schistosomum haematobium; 6, Fasciola hepatica; 7, Paragonimus 

 westermani; 8, Fasciolopsis buski; 9, Opisthorchis felineus; 10, anatomy of C. en- 

 demicus (enlarged). G. P., genital pore; V. S., ventral sucker; V. G. vitelline 

 glands; R. S., receptaculum seminis; T., branched testicles. 



larynx or attaching themselves about the glottis, produce the asphyxia 

 characteristic of the disease. 



Dicrocoelium lanceatum. This has only been reported 7 times 

 in man. The symptoms are unimportant; the fluke is about 1/3 of an 

 inch long. 



Clonorchis endemicus. This fluke and the C. sinensis are the 

 most important of the human liver flukes. Until recently these flukes 



