With attention to living invertebrates, this textbook in invertebrate zoology emphasizes the correlations between structure and function and the development of conceptual themes. This revised edition adds 300 original new illustrations, a new glossary, and new chapters covering an introduction to bilateral symmetric animals, the evolution of invertebrates, and the protochordates, including the cephalochordates, and the chaetognaths. Annotation c. Book News, Inc.