Further Observations upon a “Trichomonas” from Pond Water

Abstract

In July, 1934, I found a trichomonad-like organism in water taken from a pond in Lincolnshire. Its morphology, and method of division, and also the cultural conditions under which it will grow, have been described previously (Bishop, 1935). It was named, provisionally, “Trichomonas” keilini. In “T.” keilini, unlike most trichomonads, the undulating membrane is short, the bordering flagellum never becomes free, and there is no basal fibre beneath the undulating membrane. “T.” keilini was never found directly in the pond water but only after it was centrifuged and allowed to stand for 7–21 days.