Answer: Balantidium coli
As noted by Florida Fan, the cilia, macronucleus and cytosome (mouthparts) are plainly visible in the photos of the trophozoite (below, first image) while the macronucleus is partly visible in the cyst (below, bottom image).
As noted by Anon, the classic motility of the ciliated parasite is described as "boring" - not "uninteresting" but "rotary"!
Thank you to everyone who wrote in with the answer.
Sunday, November 2, 2014
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