OF THE ALIMENTARY TRACT 215 



Balantidium viinutum there is only one contractile 

 vacuole, at the posterior end. The meganucleus is 

 spherical, 6 to 7 microns in diameter, is about the mid- 

 dle of the body, and the chromatin is arranged in 

 several large lobes. The micronucleus is about 1 

 micron in diameter. Oval cysts were seen by Schaud- 

 inn, possessing the characteristic nucleus. 



