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Show 292 MR. E. A. SMITH O N T H E [Apr. 1, TRIFORIS ATLANTICA. (Plate XXI. fig. 26.) Testa haudperelongata, alba, livido-fusco inferne zonata; anfractus 13, anguste turriti, supremi minute cancellati, cceteri plani, granvlorum seriehus cluobus vel tribus cincti, ultimus seriebus cpdnquc, infima minus tuberculata, ornatus; Cauda brevis, carina valida instructa, fuscescens; apertura obliqua, ovata, superne canaliculata ; peristoma superne leviter incisum, infeme columella? callo crasso junctum. Longit. 6 millim., diam. 2. The outlines of this species are a little convex. Only the penultimate and antepenultimate whorls have three distinct rows of granules, and of those the central one is the smallest. The granules of the lowermost series, or rather the interstices between them, are brown and the uppermost series is white. TRIFORIS RECTA. (Plate XXIV. fig. 3.) Testa elongata, gracilis, fuscescens, ad apicem plerumque pallida anfractus 13, primi duo bicarinati, cceteri liris tribus, granos>subceciualibus, cincti, ultimus liris cluobus simplicibus medium instructus; linen siduralis canaliadctta; apertura parva, oralis; labrum superne leviter sinuatum ; columella callo incrassato induta ; canalis brevissimus, haud clausus. Longit. 5 millim., diam. 1\. This species is more slender than any of the others from St. Helena, and remarkable on account of the sculpture of the apical whorls, which is not fine as in T. melanura and T. perversa, but consists of two strong spiral keels on each whorl. The above-mentioned species also have only two series of granules on the whorls towards the apex, whereas in the present species there are three. TRIFORIS BATHYRAPHE. (Plate XXIV. fig. 4.) Testa haud perelongata, albida vel pallide fusca; anfractus 11, convexiusculi, sutura profunda sejuncti, liris spiralibus tribus subccqualibus, lirisque longitudinalibus circiter 26 c/ranose anfr. ultimus liris scxcinctus; apertura rotunde ovata; labrum tenue, superne ad suturam anguste sinuatum, inferne columella' junctum; cauda brevis, leviter recurva. Longit. 5|- millim., diam. 2. This species is peculiar on account of the deep suture and the distinct cancellation of the surface. The whorls, too, are convex, so that the central row of granules are most prominent. It is a much stouter shell than T. recta and has a different aperture. CERITHIOPSIS RUGULOSA (C. B. Adams). Cerithium rugulosum, C. B. Adams, Contributions to Conch. p. 121 ; Sowerby, Thes. Conch, pi. 184. fig. 237 (237 * ?). Hab. Jamaica (Adams) ; St. Vincent's (Brit. Mus.); Algiers (Sowerby) 1 |