HELIX-AMPELITA. 53 



H.stilpna Mabille. Shell umbilicate, subglobose-depressed, quite 

 thick, coarsely striate, under a deciduous epidermis white, ornamen- 

 ted with three broad rufous-purplish zones, two above, one around 

 the umbilicus; spire convex-globose, a little prominent, apex obtuse, 

 reticulated ; whorls 5 J, slightly convex, very rapidly increasing, sep- 

 arated by a linear quite distinct suture ; last whorl large, rounded, 

 without trace of angulation at periphery, descending and subdilated 

 at aperture ; aperture oblique, whitish within, ovate ; peristome ob- 

 tuse, thickened, reflexed ; margins approximating, columellar dila- 

 ted ; umbilicus moderate, a little widening, showing the whorls of the 

 spire, a little impinged upon by the reflexed columellar lip. Alt. 

 17-19, diam. maj. 37-39, rain. 30-32 mill. (Mabille, 1. c., p. 152.) 



Madagascar. 



H. litliida Mabille. Shell broadly umbilicated (umbilicus funnel- 

 shaped, pervious), depressed-convex, slightly thick, slightly shining, 

 chestnut colored, lightly striate, under a lens very minutely more or 

 less decussated, and especially at sutures, malleated ; spire convex, 

 little prominent, apex obtuse, submalleated, brown ; whorls 4J 5, a 

 little convex, subregularly, very rapidly increasing, separated by lin- 

 ear suture, the last whorl large, convex-rotund above, impressed 

 above the periphery, rapidly descending and obliquely dilated to- 

 ward the aperture, beneath a little convex, the umbilicus encircled 

 by a buff zone, scarcely angulated ; aperture oblique, slightly lu- 

 nate, bluish inside, regularly ovate; peristome white, thickened, 

 broadly reflexed-effuse ; margins converging, joined by a very thin 

 shining lamina, outer margin dilated, subexcavated-arcuate, colu- 

 mellar obliquely descending, substraight, a little thickened. Alt. 

 17-18, greater diam. 37-39, lesser 29-31 mill. The shell although 

 not very thick, is solid and opaque ; of a uniform reddish-brown 

 color, at times interrupted on the last whorl by little yellow spots. 

 The spire is little developed, regular but feebly projecting ; on the 

 contrary, the last whorl has great extension ; it is well rounded, with 

 a visible trace of a depression ; the slightly irregular strise are ac- 

 companied by some superficial malleations ; and the broadly ex- 

 panded but little reflexed peristome is very little thickened. (Ma- 

 bille, 1. c., p. 153.) 



Madagascar. 



H. galactostomella Mabille. Shell broadly, profoundly pervious- 

 umbilicate, depressed-conic, solid, scarcely shining, covered with a 

 rufous or chestnut-blackish epidermis ; ornamented with dense, ir- 



