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I Washington, and the early middle Miocene Kuluven suite of western A new subgenus of large plicate fossil mussels of the North Pacific, Mytilus (Plicatomytilus) n. subgen., includes three distinct species, Mytilus (P.) middendorffi Grewingk, 1850, Mytilus (P.) gratacapi n. sp., and Mytilus (P.) n. sp. This extinct subgenus ranged from central California to western Kamchatka during the Miocene. Plicatomytilus is distinguished by strong plications of the shell which deflect the plane of commissure and by the foot retractor muscle scar which is separated from the posterior byssal retractor and-Kamchatka, U.S.S.R. This previously unrecognized taxon is not, however, referable to Plic~tomytilus. Mytilus middendorffi occurs in provincial middle Miocene deposits of (1) the Narrow Cape Formation, Kodiak Island, Alaska, (2) the upper part of the Astoria Formation, Tillamook County, Oreg., (3) an unnamed formation at Coos Bay, Oreg., (4) the lower (Miocene) part of Diller's (1903) Empire Formation near Cape Blanco, Oreg., (5) the

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