Biostratigraphic studies of the larger invertebrate faunas of marine upper Oligocene to Pliocene formations of coastal Oregon and southwestern Washington have disclosed nine new gastropods and four pelecypods, described and figured herein, from the Middle Miocene Astoria Formation and from the late Miocene to early Pliocene Montesano Formation of Weaver (1912). Buccinum hannibali (Hertlein), also from the Montesano Formation, is figured and reviewed. Two new species are reported from the uppermost part of the Lincoln Formation of Weaver (1912) of southwestern Washington, and three new taxa are described from the Newport embayment, Oregon, from the Yaquina Formation and Nye Mudstone.

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