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Dall 21 that they were identical with the forms which Lea had named Unio rowelli and Unio mcneili from Central America. The locality of U. oregonensis (Oregon) is undoubtedly erroneous. Unio ochraceus and cariosus, by Chas. T. Simpson. [The Nautilus VIII, No 11, March, 1895, pp. 121-123. Two wood cuts] (23) In this paper an attempt is made to point out the differences between the closely related U. cariosus and U. ochraceus and to show that both are valid species.