557 ZOOSYSTEMA  2011  33 (4) © Publications Scientifiques du Muséum national d’Histoire naturelle, Paris. www.zoosystema.com KEY WORDS Mollusca, Gastropoda, Muricidae, Homalocantha, Siratus, Murexsul, Philippines, Caribbean, new species. Didier MERLE Muséum national d’Histoire naturelle, Département Histoire de la Terre, Unité de Paléontologie, CNRS UMR 7207, case postale 39, 57 rue Cuvier, F-75231 Paris cedex 05 (France) dmerle@mnhn.fr Bernard GARRIGUES Chemin de Ronde, F-47260 Castelmoron-sur-Lot (France) bernardgarrigues@yahoo.fr Merle D. & Garrigues B. 2011. — Description of four new species of Muricidae (Mollusca, Gastropoda) from the Philippines and the Caribbean area. Zoosystema 33 (4) : 557-575. DOI: 10.5252/z2011n4a7. ABSTRACT Four new species of Muricidae are described from the Philippines and the Caribbean area. he first two (Homalocantha granpoderi n. sp. and H. ninae n. sp.), from the Philippines, are compared with four closely related species: H. scorpio (Linnaeus, 1758), H. pisori d’Attilio & Kosuge, 1989, H. vicdani d’Attilio & Kosuge, 1989 and H. dondani d’Attilio & Kosuge, 1989. he need for comparisons based on an ontogenetic growth series is underlined for these species. For the first time, the growth series of each discussed species is illustrated. Siratus pointieri n. sp., from the Dominican Republic, is compared with three closely related species: S. cailleti (Petit de la Saussaye, 1856), S. motacilla (Gmelin, 1791) and S. kugleri (Clench & Pérez Farfante, 1945). Murexsul (M.) jahami n. sp., from Martinique, is compared with M. (M.) sunderlandi (Petuch, 1987), M. (M.) oxytatus (Smith, 1938), M. (M.) zylmanae (Petuch, 1993) and M. (M.) chesleri Houart, 2006. he characters of the spiral sculpture are described using precise structural homologies for each species. RÉSUMÉ Description de quatre nouvelles espèces de Muricidae (Mollusca, Gastropoda) des Philippines et des Caraïbes. Quatre espèces nouvelles de Muricidae sont décrites des Philippines et des Caraïbes. Les deux premières (Homalocantha granpoderi n. sp. and H. ninae n. sp.), provenant des Philippines, sont comparées à quatre espèces proches : Description of four new species of Muricidae (Mollusca, Gastropoda) from the Philippines and the Caribbean area