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Bishop, A. , 1923.—Some observations upon Spirostomum ambiguum (Ehr.). Quart.J.micr.Sci., vol. 67, pp. 391–434.

Calkins, G. N. , 1929.—Uroleptus halseyi n. sp. I. The effect of ultra-violet rays. Biol.Bull.Woods Hole, vol. 57 (2), pp. 59–68.

Coles, A. C. , 1927.—Relief staining of Bacteria, Protozoa, and Infusoria. Watson's micr.Rec., vol. 10, pp. 23–25.

Furgason, W. H. , 1940.—The significant cytostomal pattern of the Glaucoma-Colpidium group, and a proposed new genus and species, Tetrahymena geleii . Arch.Protistenk., vol. 94, pp. 224–266.

Gelei, J. von , 1936.—Beiträge zur Ciliatenfauna der Umgebung von Szeged. Math.Term.Ért., vol. 54, pp. 923–951.

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Kahl, A. , 1926.—Neue und wenig bekkante Formen der holotrichen und heterotrichen Ciliaten. Arch.Protistenk., vol. 55, pp. 197–438.

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Kent, W. S. , 1880–1882.—A Manual of the Infusoria , London, David Bogue.

Kirk, T. W. , 1885.—On some species of Vorticellae collected in the neighbourhood of Wellington. Trans.Proc.N.Z.Inst., vol. 18, pp. 215–217.

Kudo, R. R. , 1946.—Protozoology , Springfield, Illinois, Charles C. Thomas.

Lund, E. E. , 1941.—The feeding mechanisms of various ciliated protozoa. J.Morph., vol. 69 (3), pp. 563–573.

Maskell, W. M. , 1886.—On the freshwater Infusoria of the Wellington district. Trans.Proc.N.Z.Inst., vol. 19, pp. 44–61.

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Mumford, E. P. , 1940.—The present status of studies of faunal distribution with reference to oceanic islands. Proc.Sixth Pacific Sci.Cong., vol. 4, pp. 241–248.

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Nadler, E. J. , 1929.—Notes on the loss and regeneration of the pellicle in Blepharisma undulans . Biol.Bull.Woods Hole, vol. 56 (5), pp. 327–330.

Pritchard, A. , 1841.—A History of Infusoria , London, Whitaker & Co.

Roux, J. , 1901.—Faune Infusorienne des eaux stagnantes des environs de Genève. Mem.Inst.Nat.Genev., vol. 19, pp. 7–150.

Schewiakoff, W. , 1892.—Über die geographische Verbreitung der Süss-wasser-Protozoen. Verb.naturh.-med.Ver.Heidelberg (n.f.) IV, hft. 5, pp. 544–567.

Sokoloff, D. , 1930.—Las particularidades del Stentor viridis de Xochimilco. An.Inst.Biol.Univ.Méx., vol. 1, pp. 83–86.

—, 1930.—Stentor oligonucleus sp. nov. An.Inst.Biol.Univ.Méx., vol. 1, (pp. 327–328).

Stokes, A. C. , 1888.—Freshwater Infusoria. J.Trenton Nat.Hist.Soc., vol. 1 (3), pp. 71–344.

Yocom, H. B. , 1918.—The neuromotor apparatus of Euplotes patella . Univ.Calif.Publ.Zool., vol. 18 (14), pp. 337–396.