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Show 386 MR. E. A. SMITH ON THE [Apr. 18, PHYSA MADAGASCARIENSIS, Angas. (Plate XXII. figs. 18, 19.) Physa madagascariensis, Angas, Proc. Zool. Soc. 1877, p- 528, pl. 54. figs. 2a, 2b. Hab. Ekongo, S.E. Madagascar (Waters); Betsileo (Cowan). The type figured in the «Proceedings ' is larger than any ot the specimens from Betsileo, and rather broader and more globose than most of them ; but all agree in the peculiar conspicuous longitudinal subliration or plication which adorns the surface. The suture is deep and channelled, and filled up by the upper terminations of the plicae, which form fine erect lamellae. P. lirata of Tristram has a depressed spire and even stronger lira? than the present species, in which the spire is at times considerably higher than in the shell depicted by Angas. PHYSA LAMELLATA, sp. nov. (Plate XXII. figs. 14, 15.) Shell very fragile, rimate, ovate, not very glossy, olivaceous horn-colour, longitudinally coarsely lamellato-lirate. Whorls 3-4, convex, separated by a deeply channelled suture, the last descending, not square-shouldered above. Aperture occupying a little more than three fourths of the entire length of the shell. Columella but little contorted, reflexed, joined to the lip above by a thin corneous callosity, more or less striated lengthwise. Length 12 millim., diam. 9 ; aperture 9 long, 5 wide. Hab. Twenty miles from Antananarivo (Johnson). This may be but a variety of P. lirata of Tristram, of which there is a single specimen in the British Museum obtained from the collection of the late Henry Adams. It is chiefly distinguished by the difference in its form, the greater coarseness of the lirae, which have a thin lamellar epidermis attached to them. The last whorl descends near the aperture, and is not so squarely shouldered as P. lirata. PHYSA OBTUSISPIRA, sp. nov. (Plate XXII. figs. 16, 17.) Shell small, transparent, light horn-colour, narrowly rimate, somewhat glossy, indistinctly spirally striated, longitudinally plicately ridged, very regularly and strongly upon the spire and upper part of the body-whorl near the suture, the lirae on the lower part becoming subevanescent. Volutions 3^-4, very convex, rapidly increasing, separated by a deeply channelled suture. Spire very short, only a little raised above the last whorl. The latter descends in front, is large, and rounded at the shoulder above. Aperture inversely sub-auriform, and occupying about four fifths of the entire length of the shell. Columella very slightly twisted, narrowly reflexed over the umbilical fissure, connected with the lip above by a thin callus upon the whorl, which sometimes exhibits a few white lines uponit, disposed lengthwise. Length 10 millim., greatest diam. 8 ; aperture 8 long, 4\ wide. Hab. About 20 miles from Antananarivo (Johnson); Betsileo (Cowan). This, like all the known species of Physa from Madagascar, is |
