Tritons and trumpets (Ranellidae), frog shells (Bursidae) and distorsios (Personidae) have long aroused the interest of naturalists and collectors, and a species of triton was illustrated as early as 1555 in Rondelet's Libri de piscibus marinis. Many species have long-lived planktonic larvae, which results in very extensive geographic distributions, often in more than one ocean. Despite, or because of this long popularity, all this has resulted in a most confused nomenclature, obscuring the value of these species for biogeography, ecology, and biology. The present monograph is the culmination of a lifetime's work by the author on the systematics, nomenclature and evolution of the Ranellidae, Bursidae and Personidae, and it is destined to remain standard reference on the Indo-Pacific fauna for many decades. Presented as a regional monograph with outstanding colour and black and white illustrations, it covers the species associated with the coral reefs and lagoons of New Caledonia, and also describes the most diverse deep-sea assemblage of Ranellidae, Bursidae and Personidae ever documented.