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Davenport, C. B. Report on the fresh-water Bryozoa of the United States. Proc. U. S. N. Mus., Vol. XXVII, p. 211. 1904.

Kraepelin, K. Die Deutschen Susswasser-Bryozoen. Abh. Natur. Ver. Hamburg, Bd. XVIII. 1887.


Jennings, H. S. Rotatoria of the United States, with special reference to those of the Great Lakes. Bull. U. S. Fish Comm., Vol. XIX, p. 67. 1901.


Montgomery, T. H. The Gordiacea of certain American collections, with particular reference to the North American Fauna. Bull. Mus. Comp. Zool. Harv., Vol. XXXII, p. 23: 1898.


Potts, E. Contributions towards a synopsis of the American Forms of fresh-water Sponges, etc. Proc. Ac. Nat. Sc. Philad., Vol. XXXIX, p. 158. 1887.


Kent, W. Saville. A Manual of the Infusoria. Vols. I-III. London, 1880-1883.

Cash, J. The British Freshwater Rhizopoda and Heliozoa. Vols. I & II. 1905 & 1908. Published by the Ray Society.


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