The subject of this paper is a parasitic flagellate which I have obtained from the rectum of Boa constrictor, L. Owing to the kindness of Mr. W. A. Harding, of Histon, Cambridge, I was enabled to examine one of these snakes shortly after it had died of canker of the mouth. In the rectum there was about 30 c.c. of a brownish, almost odourless, alkaline fluid, containing many organic particles in suspension. This fluid was transferred to a glass dish, and prevented as far as possible from evaporating by covering with a thick glass plate fixed down by vaseline. It was by examination of this culture from time to time that the observations here recorded were made.
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C. Clifford Dobell (1907) studied this question.