NO. 5 INTERMEDIATE HOSTS OF ASIATIC BLOOD FLUKE BARTSCH 1 5 



Genotype. — Katayama nosophora Robson. 



Human schistosomiasis, its cause, and the Hfe history of the 

 organisms responsible for it furnish a fascinating chapter in the 

 history of medicine, parasitology, and malacology. No other group 

 of helminths yield the same stimulus to the historian — in fact, of all 

 human parasites malaria alone furnishes a comparable theme. How- 

 ever, it is not within the scope of the present paper to elucidate this, 

 but to render better known the mollusks constituting the key point 

 for the control of the malady produced by the Asiatic blood fluke. 



Probably no other small group of mollusks has met with more 

 vicissitudes as far as the nomenclatorial problems are concerned than 

 the members of the genus Katayama, and it is to be hoped that this 

 effort will allay further changes and result in permanent names. This 

 is especially desirable since the mollusks in question receive more 

 attention in the medical than in the malacological press, and medical 



