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Show 384 MR. E. A. SMITH O N THE [Apr. 18, Hab. River Kamony, in the north-west of the island (W. . This very striking shell is not uncommon in the above locality ; and it is surprising that so large a species has not been brought to Europe before. It cannot be confounded with any of the other forms of Melanatria, being so remarkable on account of the very strong spiral ridges. Like many freshwater shells, this is also generally coated with a black earthy deposit. CLEOPATRA TRABONJIENSIS, sp. nov. (Plate XXII. figs. 10, 11.) Shell narrowly umbilicated, turbinate, thinnish, yellowish olive, with several transverse black lines and zones. Apex worn away. Remaining volutions 3|, convex, bicarinate. Keels black; the upper one situated rather above the middle of the whorls, giving them a tabulated appearance, the lower one close to the suture; these keels are more or less obsolete on the body-whorl, especially near the lip. In addition the lower part of this volution is finely concentrically lirate, the ridges being rugose in consequence of being crossed by the lines of increment, which are rather conspicuous, and at times puckered at the carinae. The entire surface is also microscopically striated in a spiral direction. Aperture roundly ovate, showing the external coloration. Lip thin. Columellar margin a little expanded and reflexed, whitish, joined above to the extremity of the outer lip by a very thin callosity. Operculum very concave exteriorly, brown ; nucleus paucispiral, situated about halfway between the centre and the columellar edge. Length 12 millim., diam. 7 ; aperture 6 long, 4 | wide. Hab. A small lake at Trabonjy, in the north-west central part of the island (Johnson). The carination of the volutions, the minute spiral striation, the thinness of the shell, its umbilicus, and other features distinguish this species from Paludomus madagascariensis of Brot. In addition to the two dark keels, the upper part of the whorls has a broad zone at the suture, and the body-whorl has a similar band around the base in addition to one or two narrower ones above. AMPULLARIA MADAGASCARIENSIS, sp. nov. (Plate XXII ties 8, 9.) B ' Shell subglobose, narrowly umbilicated, moderately thick, sculptured with lines of growth and more or less distinct microscopic spiral striae; greenish olive, with numerous purple-brown transverse lines and zones. Whorls 6, flattened and broadly excavated above, convex at the sides, divided by a deep, pale sutural line; the last malleated in front, the aperture being towards the eye. First three whorls generally eroded and purple-black ; when perfect, in young shells, very distinctly spirally striated. Aperture ovate-pyriform, purple-brown within, yellowish on the columella and towards the lip, where the spiral lines and zones are particularly vivid. Peristome simple, the columellar margin being well curved and a little reflexed connected with the termination of the outer lip by a very thin |