Thirty-two species of Ostracoda, 15 of them new, including 3 new genera, are described from the early Middle Ordovician of the eastern United States. Two ostracode zones are represented, and a biofacies containing northern European genera is present in the Champlain Valley area. Intermingling of the Champlain Valley assemblage with that of the central Appalachian area occurred only to a limited degree.

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