4S6 



SPECIFIC MICRO-ORGANISMS 



ated in inflamed intestinal wall. Brooks^ observed Bal. coli in 

 several cases of dysentery in Orangoutangs 

 in the New York Zoological Park and 

 Brumpt^ has been able to transfer balan- 

 tidium infection from monkey to swine 

 and back to monkey. Still there is perhaps 

 some question as to the identity of the para- 

 sites found in man and in hogs. 



Balantidium Minutum. — Schaudinn in 

 1899 observed this organism in the human 

 feces. It is smaller then Bal. coli, the 

 greatest measurements being 20 X 30/*, and 

 the oral groove extends more than half 

 way 'back along the side of the cell. It 

 probably occurs rarely in the human small 

 intestine. Other species of balantidium have 

 been described. 



Sphaerophrya Pusilla. — This organism is 

 of peculiar interest because it lives as a 

 parasite within another protozoon, tljie Para- 

 mecium. The cell of Sph. pusilla is spheri- 

 cal, 20 to 40/i in diameter, and provided with 

 sucking tentacles and cilia when outside the 

 body of the host. 



1 Proc. N. Y. Path. Soc, 1903, Vol. Ill, pp. 28-39. 

 ' Compt. Rend. Soc'. Biol., igog. Vol. LXVII, pp. 103- 



Fig. 221. — Spharo- 

 phrya pusilla within a 

 paramsecium. At one 

 place there are four 

 parasites and a fifth is 

 escaping. Higher up, 

 one of the parasites is 

 just penetrating the 

 host, and a single para- 

 site is seen near the 

 center of the paramae- 

 oium. {From Do fie in 

 after Biitschli.) 



