384 MR. E. A. SMITH ON THE [Apr. 1 H, 



Hah. River Kamony, in the north-west of the island {W. John- 

 soil) . 



This very striking shell is not uncommon in the above locahty ; 

 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 urabihcated, turbinatCj 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 Urate, the ridges being rugose in consequence of being 

 crossed by the lines of increment, which are rather conspicuous, and 

 at times puckered at the carinse. The entire surface is also micro- 

 scopically 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 be- 

 tween 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 oi Brot. In addition 

 to the two dark keels, the upper part of the whorls has a broad zone 

 at the suture, and the bndy-whorl has a similar band around the 

 base in addition to one or two narrower ones above. 



Ampullaria madagascariensis, sp. nov. (Plate XXII. figs. 

 8,9.) 



Shell subglobose, narrowly umbilicated, moderately thick, sculp- 

 tured with Unes of growth and more or less distinct microscopic 

 spiral striae ; greenish olive, with numerous purple-brown transverse 

 Hnes 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 



