Seashells of the Northern Hemisphere

This complete guide to the common shelled mollusks of three great temperate regions, the Eastern Pacific (from the Arctic seas south to northern California), the Western Atlantic (from Newfoundland south to Cape Code), and Eastern Atlantic (from the British Isles to northern Portugal), explains the variation in habitats and illustrates over 550 species of gastropod and bivalve shells in a splendid array of full-color photographs.