Triton chlorostomum: Lamarck's type collection in MHNG (MHNG 1100/6). Beu designates MHNG 1100/6/3 as neotype. Type locality: Unknown. Clench & Turner, 1957 designated Jamaica as type locality. - Triton pulchellus: holotype MCZ 186135. Type locality: Jamaica.

DISTRIBUTION
Indo-West Pacific (from S. Africa to Australia, including northern Indian Ocean and Red Sea). Western Pacific (from south NSW to Japan . New Caledonia and Hawaii Islands). In western Atlantic (from Florida, USA to Bahia, Brasil) and eastern Atlantic (only found in the Canary Islands, Madeira and Ascension). It is a cosmopolitan species very common around the world. In the eastern Atlantic it appears only in isolated points without a continuous distribution. In any case it is not a rare species in the Canary Islands where the populations are growing, resulting in a very common species in its typical habitats.

DESCRIPTION
From 50 to 80 mm. Shell high-spired. Sculpture formed by variable axial costae regularly spaced and rounded and 6 coarse primary spiral cords with a groove in each cord and 2 secondary riblets between cords. They form nodules in the intersections and bulbous elevations in the middle of the whorls. Thick varices strongly shouldered in the sutural ramp. Siphonal canal medium and slightly incurved. Aperture oval with a plicate columella and broad nodules inside the outer lip. Operculum corneus with a subapical nucleus. Light reddish brown periostracum with few short hairs not covering the shell pattern. Protoconch conical with six whorls, convex and with a fine axial sculpture of striae. Basic color pale grey with regularly placed brown spots on the cords and smaller and closer spots on the varices. Orange-red apertura with white teeth and plicae. The animal is pale cream and whitelined with 2 sized spots in grey and green.

REMARKS
A shallow water species usually living between rocks. In Lanzarote it is not a very common species found in rocky bottoms in Arrecife and Puerto del Carmen mainly, although the presence of C. nicobaricum is growing in the irharbours around the island. Clench & Turner remark a subcentral nucleus that differs from the clearly subapical one found in our specimens. This interesting feature could be better studied since it could reveal differences among populations around the world.

Cymatium (Cymatium) nicobaricum (Röding, 1798). (Synonym: Cymatium chlorostomum Lamarck. Pilsbry, 1921.) Length, 62 mm; diameter, 30 mm. Shell: spire equal in length to the aperture and siphonal canal; solid and heavy, with strong, prominent axial ribs and varices; aperture and columella bright orange. Spire: protoconch of five strongly convex whorls, the suture barely indented; teleoconch elongate and acute with seven somewhat angular whorls, convex apically: suture impressed. Sculpture: five to eight strong varices arranged in three directions and crossed by strong, nodulose spiral cords and finer spiral threads; varices spaced two-thirds of a whorl apart. Aperture: subcircular; outer lip thickened and denticulate with a single series of large teeth; columella denticulate, with the plicae extending to the parietal wall; siphonal canal moderately long and gently curved. Color: white, flecked and blotched with red-brown; aperture and columella bright orange, teeth white. Shell often covered with a thick, calcareous deposit. Periostracum thin, red- brown, with bristly hairs. Animal: tan to dark brown blotches on a white background; sole of foot with lighter spots; edge of mantle skirt bordered with large, white papillae (Houbrick and Fretter, 1969). A common shallow-water species, C. nicobaricum occurs under rocks in sandy areas and shoreward on fringing reefs; specimens have also been dredged from depths of 100 m. These tritons feed on a wide variety of gastropods (Houbrick and Fretter, 1969). This species occurs through the Indo-West Pacific and in the western Atlantic (Abbott, 1974).