C204 = clone M1-48 of Paramecium caudatum containing Holospora undulata in its micronuclei has been deposited in the culture collection of the Laboratory of Invertebrate Zoology = Biological Research Institute = Leningrad University = the type is the original description and illustration of Hafkine (Ann. Inst. Pasteur Paris = 1890 = 4 = 148-162.)