Abstract
Evolutionists have spent a great deal of effort attempting to determine the interrelationships of the invertebrate phyla. This effort has been plagued by difficulties, but the quest continues. The present book contains much of interest for those concerned with the question of invertebrate interrelationships. The book is a symposium volume containing 24 different articles ranging in length from a single paragraph on Cambrian medusiforms (Sun Weiguo) to a 56-page discussion of Paleozoic arthropods (Simonetta and Delle Cave). The latter paper contains a large number of excellent drawings of reconstructions of the animals. The book's emphasis is fossils, but a phylogeny of recent invertebrates based on ribosomal RNA sequences is included (Christen et al.).