Sometimes called the most colourful creatures on earth, nudibranchs are a type of shell-less marine snail that capture the attention of scuba divers, snorkelers and tide pool-gazers with their bizarre, ornate body forms and incandescent colouration. There are over 300,000 species world-wide and some of the most spectacular specimens are native to the temperate waters of the Pacific Northwest. A diver of many years' experience, Rick Harbo presents a brilliant guide to the most notable specimens found in local waters. This durable, water-resistant 8-fold pamphlet identifies more than 50 of the most common species from California to Alaska and is an ideal companion on visits to the sea as well as a beautiful addition to the home library.