386 MR. E. A. SMITH ON THE [Apr. 18, 



Physa madagascariensis, Angas. (Plate XXII. figs. 18, 19.) 



Physa madagascmiensis, Angas, Proc. Zool. Soc. 1877, p. 528, 

 pi. 54. figs. 2a, 2b. 



Hah. Ekongo, S.E. Madagascar {Waters); Betsileo {Cowan). 



The type figured in the ' Proceedings ' is larger than any of 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 lirse 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 con- 

 torted, 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 col- 

 lection of the late Henry Adams. It is chiefly distinguished by the 

 difference in its form, the greater coarseness of the lirse, 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, some- 

 what 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 lirse 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 refiexed 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 miUim., greatest diam. 8 ; aperture 8 long, 4^ wide. 



Hab. About 20 miles from Antananarivo {Johnson) ; Betsileo 

 {Coivan). 



This, like all the known species of Physa from Madagascar, is 



