IIELIX-AMPELITA. 41 



H. DUVALLII Petit. PL 14, figs. 62, 63, 64 ; pi. 62, figs. 32, 33, 34, 



35. 



Shell with a deep, moderately wide umbilicus, depressed-globose, 

 solid and strong, opaque, yellowish or reddish-brown above, more 

 tinged with olive below, and with a narrow dark band at the periph- 

 ery, with a light band bordering above ; the suture edged below with 

 dark brown. The surface is somewhat shining, finely obliquely 

 striate above, smoother beneath ; on the upper surface there are 

 numerous spiral lines, which under a lens are seen to be composed 

 of granules on the striae of increment, as the detail drawing on pi. 

 62, fig. 34 shows. Spire low, somewhat conoidal, very obtuse ; api- 

 cal whorl minute, a trifle sunken ; suture very deeply impressed. 

 Whorls 4, very rapidly widening, the inner ones moderately convex, 

 the outer whorl quite convex just beneath the suture, then sloping, 

 somewhat flattened on the base, deeply descending in front to the 

 aperture, and with a deep and broad constriction behind the basal 

 lip, extending obliquely into the umbilicus. Aperture oblong, very 

 oblique, livid-brown within, and showing the peripheral band of the 

 outer surface ; peristome thickened, and narrowly reflexed all 

 around, brown, lighter above, upper and outer margins arched, baso- 

 columellar lip straightened, oblique, reflexed ; margins somewhat 

 converging, joined by a thick brown callus. Umbilicus deep, fun- 

 nel-shaped. Alt. 22. greater diam. 41, lesser 31? mill. 



Bay of St. Augustine, Southern Madagascar. 



H. duvallii PETIT. Mag. de Zool. 1844, pi. 93. PFEIFFER, Mon- 

 ographia i, p. 376 ; Conchyl. Cab., p. 334, t. 59, f. 7, 8 (copied). 

 REEVE, Conch. Icon., f. 178. 



A very distinct species. The lip is equally, narrowly reflexed all 

 around ; the base has a deep constriction behind the columellar lip ; 

 the aperture is irregularly oblong, baso-columellar lip straightened, 

 and the sculpture and coloration are peculiar. Figures 62-64, pi. 

 14 are from the original ones. The figures on pi. 62 are from a spec- 

 imen before me. 



H. LACHESIS Ferussac. PL 10, fig. 29. 



Shell umbilicate, subconpidal-depressed, rather solid, striatulate, 

 chestnut-brown above, white beneath ; spire short-conoidal, obtuse ; 

 whorls 5, scarcely convex, the last obsoletely dngled in the middle, 

 suddenly deflexed in front, turgid, the base somewhat flattened, 

 distinctly radiately striate, obsoletely angulated around the conical, 



