46 HELIX-AMPELITA. 



around the umbilicus ; aperture little oblique, lunate, oblong-ovate ; 

 peristome subthickened, obtuse, expanded and somewhat reflexed ; 

 margins approximating, the outer arcuate, broadly expanded, 

 columellar thickened somewhat, patulous, nodiferous, reflexed at the 

 moderate, pervious, umbilicus. 



Alt. 18, greater diam. 37, lesser 29 mill. (Mabille, in Bull. Soc. 

 Mai. France i, p. 139, 1884.) 



Madagascar. 



H. scotina Mabille. Shell rather broadly umbilicate (umbilicus 

 pervious, funnel-shaped), conico-depressed, thick, opaque, of an in- 

 tense chestnut-purplish color ; ornamented with a more or less con- 

 spicuous reddish zone behind the periphery ; very delicately striate, 

 decussated by slightly visible longitudinal lines ; little shining ; spire 

 conical, slightly prominent, apex obtuse, rugose, whitish ;. whorls 5- 

 5?, a little convex, rapidly increasing, separated by an impressed 

 suture; the last large, inflated above at the suture, delicately im- 

 pressed in the middle, sometimes lightly malleated ; at the periphery 

 rounded, beneath subcompressed, distinctly striate-costulate, slightly 

 angular around the umbilicus; aperture oblique, slightly lunate, 

 ovate, whitish inside ; peristome thick, variegated white and rufous ; 

 margins approximating, the outer patulous, lightly arcuate and ex- 

 cavated, columellar narrow, thickened, obliquely straightened, tinged 

 with fulvous. Alt. 19^-20, greater diam. 36-38, lesser 29-31 mill. 

 The shell is conic-depressed, solid, quite thick and opaque ; it is little 

 shining, of a reddish-brown color, ornamented above with a clear 

 red zonule ; there are some yellow vermiculations here and there on 

 the first whorls ; the striae are little apparent ; sometimes they are 

 accompanied by irregular oblique malleations, much elongated, and 

 assuming the form of folds. The peristome is edged with black, 

 white within. The umbilicus, of a deep chestnut color, is encircled 

 by a bright yellow zone. Its form is that of a broadly expanded 

 funnel, suddenly contracted but very narrowly and deeply penetrat- 

 ing. (Mabille, 1. c., p. 140.) 



Madagascar. 



H. omoia Mabille. Shell rather broadly and perviously umbili- 

 cated, depressed-conico-suborbicular, solid, shining, yellowish-tawny, 

 very sharply striate and with decurrent lines, 3-banded. Spire 

 conical, slightly prominent, apex rather large, obtuse, striatulate ; 

 whorls 4i-5, a little convex, subregularly and very rapidly increas- 

 ing, separated by an impressed suture ; the last whorl large, broadly 



