Abstract
In 1932 the author described Trichodila renicola from the urinary tract of the pickerel, Esox iiger, in Oneida Lake. This was the first record of a Trichodina from the urinary bladder of a fish. On numerous subsequent occasions the urinary tract of Esox lucius from various localities was examined for related ciliates, but with negative results. An added interest therefore attaches to the discovery of a similar parasite in the urinary passages of the muskalonge, Esox masquinongy, of Chautauqua Lake, N. Y. This parasite was present in all adult muskalonge examined.
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