Abstract
There is little correlation between the abundance of Oligochaeta in bottom samples collected by the Michigan State Conservation Department and the U.S. Bureau of Commercial Fisheries, Ann Arbor, during 1965 and the environmental factors measured. The factors of primary significance for the determination of habitats of oligochaete species have yet to be identified. Their distribution in Saginaw Bay is influenced by the inflow of the polluted Saginaw River, as evidenced by the presence of Paranais litoralis and the high percentage of Limnodrilus hoffmeisteri in samples from the innermost part of the bay.
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