384 MR. E. A. SMITH ON THE [Apr. 18, 
Hab. River Kamony, in the north-west of the island (W. John- 
son). 
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. noy. (Plate XXII. figs. 10, 11.) 
Shell narrowly umbilicated, turbinate, thinnish, yellowish olive, 
with several transverse black lines and zones. Apex worn away. 
Remaining volutions 33, 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 carine. 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, 43 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. figs. 
8, 9.) 
Shell subglobose, narrowly umbilicated, moderately thick, sculp- 
tured with lines of growth and more or less distinct microscopic 
spiral strize; 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 
