Includes index.

Contents: Introduction -- Classification, systematics, and phylogeny -- Animal architecture and the Bauplan concept -- The metazoa: Development, life histories, and phylogeny -- The protozoa -- Four phyla of Uncertain affinity -- Phylum porifera: The sponges -- Phylum cnidaria -- Phylum ctenophora: The comb jellies -- Phylum platyhelminthes -- Phylum nemertea: The ribbon worms -- "Pseudocoelomates," priapulans, gnathostomulids, and loriciferans -- Phylum annelida: The segmented worms -- Four phyla of coelomate worms -- Four phyla of coelomate worms -- Phylum arthropoda: The arthropod bauplan and the trilobites -- Phylum arthropoda: The cheliceriformes -- Phylum arthropoda: The insects and myriapods -- Three enigmatic groups and a review of arthropod phylogeny -- Phylum mollusca -- Other deuterostomes: Chaetognatha, hemichordata, chordata -- Perspectives on invertebrate phylogeny.