28o RESEARCH IN PROTOZOOLOGY 



organisms. They resemble what are known as "Jolly bodies" 

 which frequently occur within the red cells of men and other 

 animals. 



NEOSPORIDIA 



The MYXOSPORiDiA are parasites of cold-blooded animals, prin- 

 cipally fish. We owe to Kudo (1919) the most extensive mono- 

 graph of this group. To Kudo we are indebted also for an extensive 

 monograph on the microsporidia most of which occur in arthro- 

 pods. These two groups need not be considered further in this 

 place. 



The SARCOSPORiDiA are muscle parasites of vertebrates. They 

 occur in reptiles, birds and mammals. The best known species is 

 Sarcocysfis inuris that occurs in rats and mice. Other sarco- 

 SPORiDiA are common in sheep, cattle and horses. Very little is 

 known regarding the method of transmission of the sarcosporidia. 

 Several cases of sarcosporidiosis have been described from human 

 beings. It has been suggested that these were really species that 

 normally occur in other animals and that accidently succeeded in 

 invading the muscle of man. 



