This best-selling introduction to the biology of invertebrates through survey by groups emphasizes adaptive morphology and physiology while covering anatomical ground plans and basic developmental patterns. Rich illustrations, systematic resumes, and extensive citations make it a valuable reference source.

1. Introduction

2. Protozoa

3. Sponges and Placozoans

4. Cnidarians and Ctenophones

5. Bilateral Animals

6. Platyhelmiths

7. Nemerteans

8. Aschelminthes

9. Non-Segmented Coelomate Worms

10. Molluscs

11. Annelids and Pogonophorans

12. Introduction to the Arthropods

13. Chelicerates

14. Crustaceans

15. Myriapods

16. Insects

17. Protochor-dates and Chaetognaths

18. Echinoderms

19. Lophophordates and Entopracts

20. Patterns of Invertebrate Evolution