The authors acknowledge with thanks help from S.L. Welsh, Brigham Young, University, Provo, Utah particularly in checking the maps and supplying additional information. Cheryl McJannet and Jacqueline Madill are thanked for help with preparing the images. The Nunavut Research Institute and Polar Continental Shelf Project are thanked for logistic support. We thank P. Taouk for computer technical support, and M. Beaulieu-Bouchard for help with geographical data entry. The Canadian Museum of Nature and the Commonwealth Scientific and Industrial Research Organization, Australia are acknowledged for financial support.