This important and extensive volume presents part of the Proceedings of the Fourth International Crustacean Congress held in Amsterdam in 1998. As the title implies, 'Crustaceans and the Biodiversity Crisis' was the general, underlying theme of all contributions at the congress. With the turn of the century, someone ought to 'assess the balance' of our natural environment and of the various branches of biology that study its rapidly declining diversity. From the five subthemes covered at the conference, those of (1) Diversity in Time and Space (including Systematics, Phylogeny, and...