Abstract
cerned over the possibility that the sea lamprey, Petromyzon marinus Linnaeus, might have invaded the river systems of the state from Lake Michigan. Because of their concern, the Illinois State Natural History Survey and the Illinois State Department of Conservation began a survey of the parasitic lampreys of the larger rivers in 1949, and continued the investigation through 1959. Of the 454 lampreys taken from the rivers during the study all but one belonged to the freshwater genus Ichthyomyzon. The single sea lamprey (now in the Natural History Survey collection) was reported to us as having been taken from the Du Page River, a tributary of the Illinois River in extreme northeastern Illinois; but inasmuch as substantial evidence that the collector actually found the specimen in the Du Page River has not been obtained, we consider the record as doubtful. The occurrence of the sea
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