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PROTOZOOLOGY 



imbedded in the muscle cells which are distended, and may appear 

 white-streaked to naked eye. Seen in sections, the body is divided 

 into compartments. Gilmore, Kean and Posey (1942) have recently 

 found three bodies in sectioned heart muscles of an eleven year old 

 child who died from an unknown cause, and considered them as 

 sarcosporidian bodies. They measured 25m by 19m, 57m by 30m, and 

 41m by 25m hi cross sections; there were no septa within the bodies; 

 minute bodies present in the masses were mostly rounded and about 

 1m in diameter, though a few were crescentic. The questions such as 

 what species infect man, how man becomes infected, etc., are un- 

 answered at present. 



Muscle layer 

 Connective tissue layer 



Fibrous zone 



External} 



Median /Cyst membrane 



Internal ) 



Sporoblasts 



Spores 



Fig. 274. Portion of a cyst of Sarcocystis tenella in sheep, X about 

 1000 (Alexeieff). 



S. tenella Railleit (Figs. 273, a; 274). In the muscles of tongue, 

 pharynx, oesophagus, larynx, neck, heart, etc., of sheep; large 

 parasites 40m~2 cm. long with a thin membrane; spores sickleform 

 (Alexeieff, 1913; Scott, 1943). 



S. miescheriana (Kiihn) (Fig. 273, b). In the muscles of pig; cysts 

 up to 3-4 mm. by 3 mm.; envelope striated; "spores" reniform. 

 Musfeldt (1950) found 15 of 264 pig diaphragms examined were in- 

 fected by a Sarcocystis. The pigs were all garbage-fed animals. 



