894 THE ANIMAL CARRIERS OF DISEASES 



Family Physidse Dall. 



Definition. — Basommatophora with visceral mass and shell 

 sinistrally coiled. Shell thin, with a narrow aperture; tentacles 

 cylindrical. No inferior pallial lobe. 



Type Genus. — Physa Draparnaud. 



Remarks. — Physopsis is distinguished from Physa by the spire 

 not being at all exserted, and having the columella truncated at the 

 end. 



Phya or Physopsis africanus is the carrier of S. hcBmatohium in 

 Brazil. 



Trematode Infections. 



Trematode. 



Defini- 

 tive 

 Host. 



Defini- 

 tive 



Reser- 

 voir. 



Trans- 

 mission. 



Intermediate 

 Host. 



Infection. 



Fasciola 

 hepatica. 



Man. 



Sheep. 



Miracidium 

 in water. 



Penetrative. 



Species of 

 Limnaea. 



Cercaria encysted 

 on weeds. 



Ingestive. 



Fasciolopsis 

 buski. 



Man. 



Pig. 



Miracidia 

 in water. 



Shrimps {?). 



(?) 



Ingestive (?). 



Metagonimus 

 yokogawai. 



Man. 



Un- 

 known. 



Ditto. 



Melcenia 

 libertina. 



Cercaria under 

 scales of fish. 



Ingestive. 



Paragonimus 

 ringeri. 



Man. 



Gar- 

 ni vora. 



Ditto. 



Ditto. 



Cercaria in 

 water. 



Penetrative, 

 or in crabs 

 ingestive. 



Clonorchis 

 sinensis. 



Man. 



Cats, 

 dogs, 

 pigs. 



Ditto. 



Ditto. 



Cercaria encysted 

 in muscles of fish. 



Ingestive. 



Schistosoma 

 hesmatobium. 



Man. 



Man. 



Ditto. 



Subgenera 

 and species 

 of Bulinus. 



Cercaria in water. 

 Penetrative. 



Schistosoma 

 mansoni. 



Man. 



Man. 



Ditto. 



Species of 

 Planorbis. 



Cercaria in water. 

 Penetrative. 



Schistosoma 

 japonicum. 



Man. 



Cats. 



Ditto. 



Blandfordia 

 nosophora 

 vel japonica. 



Cercaria in water. 

 Penetrative. 



