Title from title screen (viewed September 24, 2014).
Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).
"Known first in the early Tertiary of Japan, the genus Mya migrated to western North America, the Arctic Ocean, and to both sides of the North Atlantic."
Bibliography
Includes bibliographical references (pages G45-G47) and index.