DISTOMIASIS. 197 



were known as Opisthorcis sinensis. This fluke is very common in 

 China and Japan in certain sections of Japan, 20% of the population 

 being infected. This fluke is about 3/4 of an inch long and 1/6 of an 

 inch broad. When squeezed out of the thickened bile ducts it is so 

 transparent and glairy as almost to resemble glairy mucus. This 

 fluke is supposed to produce most serious symptoms, as indigestion, 

 swelling and tenderness of liver, ascites, oedema, and a fatal cachexia. 

 As a matter of fact, many physicians in China attribute very little 

 pathogenic importance to it. The disease is diagnosed by the presence 

 of the ova in the stools. 



Opisthorchis felineus. This fluke is smaller than the C. endemi- 

 cus, and is a common parasite of the gall bladder and bile ducts of cats. 

 In certain parts of Siberia the parasite is found in more than 6% of the 

 human autopsies. 



Intestinal Flukes. 



Cladorchis watsoni. This fluke is about 1/3 of an inch long, and 

 has an indistinct oral sucker and a large sucker at the other end. 

 This parasite has only been once reported. 



Gastrodiscus hominis. This fluke is about 1/4 of an inch long 

 and has a disk about 1/6 of an inch in diameter from which proceeds a 

 teat-like projection, bearing an oral sucker. While it has only been 

 reported twice for man, indications are that it is probably fairly 

 common in India and Assam. 



Fasciolopsis buski. This is probably a rather common parasite 

 in India, as Dobson found the eggs in i% of the stools of more than 1000 

 coolies. The fluke is from 2 to 3 inches in length and about 1/2 of an 

 inch in breadth. It is thick, brown in color and has a very large 

 acetabulum. These parasites cause dyspeptic symptoms and an 

 irregular diarrhcea. 



Heterophyes heterophyes. This exceedingly small fluke, which 

 can be recognized by its small size (less than 1/12 of an inch long) and 

 large, prominent acetabulum, was formerly supposed to be rare. Looss, 

 however, has shown that it is quite common in Egypt, he having found 

 it twice in Alexandria in 9 autopsies. The parasites occupy the ileum. 

 It is common in dogs. 



