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Show 276 MR. E. A. SMITH ON THE [Apr. 1, paulo reflexo, rimam umbilicalem angustam semiobtegente ; plica columellce haud perspicua. Longit. 2\ millim., diam. fere 1. The fold or twist of the columella in this minute species is high up and not conspicuously developed. TURBONILLA ASSIMILANS. (Plate XXIII. fig. 19.) Testa elongata, gracilis, alba, nitida, subpellucida; anfractus 9-10, convexi, lente accrescentes, costis tenuibus, qracilibus, (in anfr. penult, circiter 20) leviter obliquis, instructi, lirisque spiralibus paucis circa partem inferiorem inter costas ornati; apex magnus, globosus; anfr. ultimus costis basim versus obsoletis ; apertura parva, subovata ; columella leviter torta. Longit. 4j| millim., lat. 1. Turbonilla acicularis, A. Adams, from the Philippine Islands, and T. pusilla, C. B. Adams, from Jamaica, have very much the same form as the present species. The latter, however, is rather more slender, and has fewer riblets than T. assimilans, whilst the former has flatter whorls and coarser costae. TURBONILLA TRUNCATELLOIDES. (Plate XXIII. fig. 20.) Testa elongata, solidiuscula, alba, linea flavescente circa medium anfractuum ornata; anfract. 7, primus (apex) pellucidus, globosus, cceteri levissime convexi, sutura profunda sejuncti, costis longitudinalibus 15-16 crassis, interstitiis latioribus, instructi ; anfr. ultimus linea secunda flavescenti infra medium cinctus ; apertura subpyriformis ; columella superne plicata; peristoma continuum, margine columellari leviter reflexo. Longit. 4 millim., diam. \\. This species agrees in its general appearance with the section Mormula, but has a rather more distinct fold than 31. rissoina, the type of this so-called genus. TURBONILLA BRACHIA. (Plate XXIII. fig. 21.) Testa minima, brevis, turrita, pellucida, albida, nitida ; anfractus 4\, apicales Iceves, convexi, tres sequentes convexiusculi, sutura profunda paulo obliqua sejuncti, costis bene arcuatis circiter 20 (in anfr. ultimo inferne attenuatis) instructi, paulo infra suturam, sulco inconspicuo, costas secanti, sculpti; apex maximus, obtusus ; apertura ovalis, superne acuminata, longit. totius 5 adcequans; columella leviter reflexa, spiraliter torta, labro callo tenui juncta. Longit. 1| millim., diam. \. The short stumpy form, the very large obtuse apex, the much curved ribs, and the deep suture are the principal distinguishing features of this little species. TURBONILLA (DUNKERIA) ERITIMA. (Plate XXIII. fig. 22.) Testa subulata, pellucida, vitrea, nitida ; anfractus normales 6, convexi, liris longitudinalibus numerosis, arcuatis (ir. anfr. |