A systematic treatment, organized by phylum, of virtually every group of marine invertebrates of the Pacific Northwest, including some 4,000 species, many illustrated with b&w photographs and drawings. Includes useful checklists, bibliographies, keys, and a glossary. This first paperback edition contains some 30 pages of additions and corrections to the hardcover 1987 edition, which itself was a greatly revised and expanded edition of Keys to the Marine Invertebrates of Puget Sound, the San Juan Archipelago, and Adjacent Regions , 1974 (also U. of Washington Press). Annotation c. by Book News, Inc., Portland, Or.