W. Healey Dall, Summary of the marine shellbearing mollusks of the northwest coast of America, from San Diego, California, to the Polar Sea, mostly contained in the collection of the United State National museum, with illustrations of hitherto unfigured species. Washington: Government Printing Office, 1921, p. 217.

W. Healey Dall, Summary of the marine shellbearing mollusks of the northwest coast of America, from San Diego, California, to the Polar Sea, mostly contained in the collection of the United State National museum, with illustrations of hitherto unfigured species. Washington: Government Printing Office, 1921, p. 217.