30 TROPICAL MEDICINE AND HYGIENE 



junction of anterior and middle third and tapers from 

 that point posteriorly. 



Echinostoma ilocana (fig. 15). Eggs have been found 

 in the motions of five patients from Luzon district. 

 4 to 6 mm. in length ; greatest diameter 075 to 1-35 mm., 

 and thickness 0*5 to ro mm. 



Oral sucker broader than long, 150 /* by 100 fju. Dorsal 

 lip most prominent. Ventral sucker 500 //, in diameter. 



CEsophagus short ; caeca extend nearly to the posterior 

 extremity. No branches. Ovary globular and about the 

 middle of the body. Testes indistinctly bilobed. Genital 

 pore anterior to the acetabulum. Yolk-glands abundant 

 and extend from the level of the acetabulum to the 

 extreme posterior end of the worm. 



The worms were expelled after treatment by thymol ; 

 they are therefore intestinal, and no symptoms are known 

 to be caused by them. Eggs operculated, yellowish in 

 colour, 100 IJL by 6 to 7 /m. 



Echinostoma malayanna found at a post-mortem in the 

 Malay States. 8 to 12 mm. long by 3 to 3*3 mm. in 

 breadth. Testes lobulated, the anterior the smaller. 

 The spinous ring composed of 43 spines. 



HEIEROPHYES. 



Heterophyes. The ovary and testes are rounded bodies. 

 The testes are posterior to the ovary and nearly at the 

 same level. The ventral sucker is much larger than the 

 oral, it is nearly in the middle of the ventral surface and 

 the openings of the genital organs are below and to one 

 side of it. 



The yolk-glands are not numerous. 



Heterophyes heteropliyes is found in natives of Egypt 

 and has been found in Chinese and Japanese in London. 

 It occurs in the intestine. It is a very small fluke, only 

 i mm. long by 0-5 mm. broad, and it is so easily over- 

 looked that it is probably a more common worm than it 

 is usually supposed to be (fig. 16). It may be associated 

 with dysenteric diarrhoea. 



