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Show 268 MR. E. A. SMITH ON THE [Apr. 1, colour, however, the columella and the denticles within the outer exactly resemble T. olearium. T. aquatilis (Reeve, Conch. Icon. fig. 24) has a great affinity with T. pilearis (Reeve, I.e. fig. 23), and both have an equally wide range. Both occur at the Philippine Is., Japan, the Red Sea, and the West Indies; and the general structure of the two forms is so very similar, that I am inclined to think that eventually, when large series can be re-examined, it will be impossible to distinguish them. The shell in the d'Orbigny collection marked " T. martinianum, d'Orb."l, is quite a typical aquatilis, and his three examples of T. americanum2 from Rio Janeiro, which he formerly considered T. pilearis3, certainly belong to T. olearium. The largest specimen from St. Helena, which is much broken, when perfect must have measured about four and a half inches in length. TRITON TURTONI. (Plate XXI. figs. 13, 13 a.) Testa elongata, fusiformis, turrita, rufescens, varicibus albidis, rufo-zonatis, instructa; anfr. 11, embryonates 6 pallidefusci, convexi, cceteri superne tabulati, angulati, inferne ad suturam valde constricti, liris spiralibus, costis longitudinalibus, rotundatis, varicibusque paucis instructi; costae ad, angulum prominentes (in anfract. penultimo 7), in ultimo infra medium obsolete; lirce transversae, incequales; apertura longe intus lurida, cum canali longit. totius \ cequans ; labrum intus album, liris circiter 6 instructum, ad marginem paribus senis denti-culorum partim fusco-tinctorum armatum ; columella in medio arcuata, plus minus purpureo-nigra, rugis transversis, graci-libus, albis ornata; canalis intus albus, recurvus. Longit. 49 millim., lat. 20. This is a very distinct species, and well characterized by the angled tabulated whorls which are much constricted at the lower suture. On the five normal whorls there are only four varices, two on the body-whorl and two on the penultimate. Of the spiral ridges, one marking the angle and one below it, and which are nodose upon the costae, are most conspicuous. RANELLA CJELATA, Broderip. This species is common on the coast of Panama, and it is extremely remarkable that it should occur at St. Helena. The single specimen collected by Mr. Melliss4, and presented to the British Museum, corresponds in every particular with Panama examples; but those obtained by Capt. Turton partly belong to the same variety, and partly to that named R. pustulosa by Reeve, from Ascension Island, which differs from the Panama type in having fewer and larger tubercles. A specimen collected by Staff-Surgeon 1 Sagra's Hist. Cuba, Mollusques, vol. ii. p. 162. 2 Voy. dans l'Amer. Merid., Moll. p. 711. 3 Ibid. p. 449. 4 Vide Jeffreys, Ann. Mag. Nat. Hist. 1872, vol. ix. p. 264. |