1882.] MOLLUSCAN FAUNA OF MADAGASCAR. 379 



still finer. C. sarcodes, Pfr., is still higher in the spire, with higher 

 volutions, and more strongly iirate, especially on the lower surface of 

 the last whorl. 



VlTRINA MADAGASCARIENSIS, Sp. DOV. (Plate XXI. figS. 6, 7.) 



Shell ventricose, depressed, very thin, diaphanous; pale greenish 

 yellow, with a brown Hue at the suture, and with the upper part of 

 the outer lip of the same colour, brilliantly glossy. Spire small, a 

 little elevated and obtuse at the apex. Whorls 3|, convex, deep, and 

 margiued above at the suture ; the first Ig microscopically decussated 

 in a beautiful manner by minute spiral striae and very fine lines of 

 growth, the last two lacking the spiral striae. Body-whorl large, with 

 distinct, here and there subplicate, lines of growth, on the lower 

 surface exhibiting indications of interrupted concentric striae. Aper- 

 ture subhorizontal, large. Columella arcuate, thin, wrinkled, as is 

 also the base of the peristome. 



Greatest diam. I5| niilUm., smaller 12, height 9. 



Hab. Betsileo {Cowan). 



This I believe is the only species of Vitrina at present known 

 from Madagascar ; and it bears some resemblance to certain forms of 

 the genus from South Africa. 



Helix (Nanina ?) balstoni, Angas. 



H. balstoni, Angas, Proc. Zool. Soc, 1877, p. 528, pi. 54, f. 5. 



Hah. Interior of Madagascar {Angus) ; forest 36 miles east of 

 Antananarivo {Johnson). 



The specimen presented to the British Museum by Mr. Johnson 

 is narrowly perforated, in which respect alone it differs from the 

 description of tliis species given by Angas. Two other shells in 

 the Museum are also narrowly perforate ; and even the above-quoted 

 figure looks as if the example delineated were likewise umbilicate ; 

 so that it is possible the species was described as " imperforate " 

 accidentally. 



Helix (Nanina ?) cleamesi, sp. nov. (Plate XXI. figs. 8, 9.) 

 Shell very thin, semitrausparent, vinous horn-colour, narrowly 

 perforate, suborbiculately conical, keeled at the periphery, marked 

 with curved Hues of growth crossed and rendered minutely granular 

 on the spire by fine concentric striae, more finely concentrically 

 striated on the under surface, more glossy and not granuliited. 

 Spire with slightly convex outlines, shortly conical, ending in an 

 obtuse tip, Whorls 6, a little convex, regularly increasing, a little 

 depressed near the lower submarginal suture, or, in other words, just 

 above their periphery. Last volution keeled above the middle, the 

 carina being less marked near the outer lip. Base convex. Aper- 

 ture somewhat oblique, lunate. Outer hp obhquely arcuate above 

 the feeble carination, straightish or even a little siuuated below it in 

 a very slanting or receding direction. Columella narrowly expanded 

 and reflexed over the perforation, forming below, with the basal edge, 

 a regular wide curve. 



