An Abridged Check List and Bibliography of West North American Marine Mollusca

Remarks on the Taxonomy and Intertidal Distribution of Littorina in the San Juan Archipelago, Washington

“…Finally my thanks are given to Friday Harbor Laboratories and their staff for the kind help and facilities given me during my stay there. The distribution of the species of Littorioo that occur on the west coast of North America has been given by Keen (1937). This author remarked that scutulata occurs from 19°N latitude to 58° and that sitkaoo and rudis are found from 48° to 56°.…”

The Geologic History of Baja California and Its Marine Faunas

“…3;Nygren, 1950) during the Cenozoic era (Fig. Nearly 2500 living species are recognized by Keen (1958) in her recent study of living 1 Olsson's assignment of the Pontian stage to the late Miocene rather than to the early Pliocene may modify the dating of that event in terms of the western United States "megafaunal" chronology. Those routes were finally closed during the late Miocene (Olsson, 1932: 39, 43 1).…”

“…No comprehensive review of the shelled mollusks living in the eastern Pacific is available, but from Keen's (1937) checklist of the fauna from San Diego to Alaska, and from her recent (1958) book on mollusks of the region from the Bay of Panama to the Gulf of California, it would appear that the total shelled molluscan fauna of the eastern North Pacific numbers well over 4000 species. No comprehensive review of the shelled mollusks living in the eastern Pacific is available, but from Keen's (1937) checklist of the fauna from San Diego to Alaska, and from her recent (1958) book on mollusks of the region from the Bay of Panama to the Gulf of California, it would appear that the total shelled molluscan fauna of the eastern North Pacific numbers well over 4000 species.…”

“…The genera Strombina, Terebra, Cancellaria, and Chione have diversified and flourished in the eastern Pacific (Keen, 1958: 2) while becoming impoverished in the Caribbean, relative to their status during Miocene and earlier epochs. Post-Miocene changes produced marked distinctions, however, within other molluscan taxa.…”

“…AfterKeen and Bentson, 1944. 2 From Clark andVokes, 1936;Clark and Durham, 1942; Keen, 1940;Merriam, 1941;Vokes, 1939; unpublished data.…”