SCHISTOSOMA J A PON I CUM 



591 



and Hiroshima of Central Japan and Saga of Kinshu. Eggs con- 

 taining a miracidium were to be found in the liver and other organs. 



Katsurada then examined cats in the neighbourhood, and found 

 numerous Schistosoma in the portal veins of two cats in the province 

 of Yamanashi, in which there were eggs exactly similar to those 

 found in the above-mentioned disease. Catto a little later found the 

 - same parasite in a Chinaman from the province of Fukien. Logan 

 and others have found it in Chinamen in the province of Hunan, 

 Nicols in a case from the Philippines, and Manson and Sambon in 

 cases from China. 



Fig. 235. — Schistosoma japonicum Katsurada, 1904. Male and 

 Female. (From a photograph by J. J. Bell.) 



With regard to the life-history, in 1908 Fujinami and Nakamura 

 immersed cattle, cats, and dogs in water containing many miracidia 

 from S. japonicum, but no infections followed. They then immersed 

 a second series in rice-fields, ditches, and streams, reputed to be 

 sources of infection, and heavy infections with 5. japonicum resulted, 

 the young parasites, 0-15 mm. in length, being found'in the portal 

 system on the third day afterlimmersion. 



Fig. 236. — Schistosoma japonicum Katsurada, 1904. Female. 

 (From a photograph by J. J. Bell.) 



In 1911 Miyagawa described smaller forms as seen in the cutaneous 

 tissues and peripheral vessels in two to twenty-four hours after 

 immersion. 



In 1913 Miyairi, experimenting with local snails, found a sporo- 

 cyst in an unidentified snail. 



In 1914 Miyairi and Sudzuki found a snail with a dark shell with 

 seven spirals to be heavily and naturally infected with cercariae, 

 and, taking non-infected young samples, were able to find that the 

 miracidia penetrated the cuticle of the snail, and found their way 



