300 



FLAT WORMS 



J 4-U~ 



Philippines. He found it in 17 cases in one year. The life history, beyond the 

 the stage of miracidium, is unknown. 



Another fluke which has been reported from the lung is Fasciola gigantea (very 

 similar to F. hepatica). This was coughed up by a French officer who had been in 

 Africa. 



Ova of the Parasitic Worms or Man 

 TREMATODA 



DRAWN TO S C A L C X IOOO 



Heterophyes 

 heterophyes 



Dicro 

 coelium 

 lance utum 



P~*4 Fasciola 



*_ 



Fasciolopsis 



Opisthorchis 

 felineus ( 



Clqiiorcliis Clonorchis 

 sinensis endemicus 



iMudiix-il fioiii Looss 1(K>;) 





n i 



//J; 



Schistosoma 



FIG. 66. Trematode ova. 



BLOOD FLUKES 



Schistosoma haematobium. Flukes of the circulatory system are 

 of great importance in Egypt, South Africa, Japan, and the West 

 Indies. The disease is named bilharziasis after Bilharz who in 1851 

 first associated the parasite and the disease. 



It seems probable that there are at least three human species, 

 differentiated principally by the appearance of the egg. In the blood- 

 fluke disease of Egypt (S. hamatobium) , the parasite chiefly infects 

 the bladder and the egg has a terminal spine. The terminal-spined 

 ovum is also found in the rectum and in the faeces. In the West 



