Book excerpt: Learn about the many kids of tropical seashells with this useful and portable reference book. This handy pocket guide introduces 170 mollusk species found in Southeast Asia. These fascinating shelled animals vary greatly in shape and size, with equally diverse behaviors. As a quick reference to those families of mollusks most frequently encountered, together with the informative text and delightful color photographs for easy identification, this book is a "must" for beachcombers and underwater enthusiasts. Periplus Handy Pocket Guides are practical field guides, useful for identifying various natural objects ranging from plants and animals to gemstones and seashells. Each page of each title throughout the series is filled with clear, precise photographs and informative text. Scientific and local language names are given.