Marine Invertebrates of the Pacific NorthwestNow available in a paperback edition, updated with 30 pages of additions and corrections, this work provides a systematic treatment of almost every group of marine invertebrates of the Pacific Northwest. Close to 4,000 species are covered and many are illustrated by photographs or drawings. Developed over a period of more than 30 years by zoologists associated with the Friday Harbor Laboratories of the University of Washington and several other