T. R.  Abbott, American seashells: the marine Mollusca of the Atlantic and Pacific coasts of North America, 2nd ed. New York: Van Nostrand Reinhold Company, 1974, p. 541.

T. R.  Abbott, American seashells: the marine Mollusca of the Atlantic and Pacific coasts of North America, 2nd ed. New York: Van Nostrand Reinhold Company, 1974, p. 541.