HELIX-AMPELITA. 35 



descending in front, and have the labrum more or less (sometimes 

 entirely) violet-brown. 



H. STUMPFFII Kobelt. PI. 62, figs. 39, 40. 



Shell not very widely but deeply umbilicate, lenticular, acutely 

 keeled, thin but strong, with very fine lines of increment and still 

 finer, close spiral lines, making the surface finely granulate, yellow- 

 ish-green, whitish toward the suture, the apex lilac, encircled by two 

 narrow intense chestnut-brown bands, one midway between suture 

 and keel, and ascending the spire, the other is a little distance below 

 the keel. The 4 whorls increase rapidly, and are scarcely convex ; 

 the upper whorls are a little impressed above the level suture ; the 

 last one is acutely keeled, and compressed both above and below the 

 keel, which appears as an acute angle. The whorl does not descend 

 in front, is unevenly swollen below, and is compressed into a blunt 

 crest around the narrow, funnel-shaped, but perforating umbilicus. 

 The aperture is irregularly rhombic, very oblique, rosy inside and 

 showing the bands of the outer surface. The peristome is thickened, 

 beautifully rosy ; its terminations are not converging, not joined by 

 a callus ; the upper margin is expanded, concave above the carina, 

 the basal margin is rounded, reflexed, the columellar margin short- 

 ly ascending, partly covering the umbilicus, but very little expanded. 

 (Kobelt.) 



Alt. 15, greater diam. 26, lesser 22 mill. ; aperture 13 mill, long, 

 11? broad. 



Forest of Loucoube Island of Nossi-be, off Madagascar. 



H. stumpffii KOB. Nachrichtsbl. d. Deutsch. Mai. Gesellschaft, 1880, 

 p. 31 ; Jabrbiicher d. Deutsch. Mai. Ges. 1880, p. 332, t. 7, f. 3, 4. 

 CROSSE, Journ. de Conchyl. 1881, p. 196. 



Closely allied to H. cazenavetti, but differs in the thinner, more 

 shining shell, the flatter form, and the dark, contrasting, brown 

 bands. 



H. CAZENAVETTI Fischer & Bernardi. PI. 63, figs. 48, 49. 



Shell orbicular-depressed, rather solid, perforate, concentrically 

 very minutely striate, with oblique, obsolete submalleated lines, 

 shining, yellow ; whorls 3<j, rapidly increasing, plane ; suture scarcely 

 impressed, tinged with violet ; last whorl very large, carinated, very 

 convex beneath; umbilicus violet-tinted; aperture triangular, 

 angulate ; peristome white, reflexed, not descending, violet at the 



