24 TROPICAL MEDICINE AND HYGIENE 



Prophylaxis. Though probably carried by a mollusc 

 the particular species is unknown. It is not certain how 

 man becomes infected. It is not probable that the cercariae 



Ms. 



Vs. 



FIG. 10. Dicroceelium lanceatum, Stil. and Hass. 15/1. V.s., ventral 

 sucker; Cb., cirrhus pouch; /., intestinal bifurcations; V.sc., vitelline sacs; 

 7\, testicles ; O. , ovarium ; Ms., oral sucker; //., uterus. 



are inhaled, but like the cercariae of other flukes, are pro- 

 bably taken into the mouth with uncooked vegetables or 

 in drinking water. How they find their way to the lungs 



