This fourth volume of the encyclopedia of the Modern Coral Reef Aquarium covers important invertebrate groups: Mollusks, such as snails, slugs and bivalves, commonly found in the trade are discussed in detail. Like in previous volumes of this book series, also more obscure and rare members of the phylum are covered to the extent that this can be of value to the marine aquarist. Echinoderms ? or spiny skinned animals ? are shown in spectacular photos and the biology and aquarium care of the many interesting brittle stars, starfishes, sea cucumbers, and sea urchins are described in detail. This book also discusses the interesting group of sea squirts, or tunicates. These organisms, which are very insufficiently covered in most aquarium books, are dealt with in detailed accuracy and illustrated with over 700 magnificent color photos. As an introduction to the book, Dr. Bruce Carlson (former director of the Waikiki Aquarium/Hawaii) has written a fascinating chapter on ?The Future of Coral Reef Aquarium?. Buy this 440-page book and complete your knowledge on the invertebrates of ?The Modern Coral Reef Aquarium?!