HELIX-AMPELITA. 37 



H. lancula FERUSSAC, Histoire, t. 65, f. 4-6. PFR. Symbolse iii, 

 p. 79; Monographia i, p. 394; Conchylien Cab., t. 61, f. 12-14 

 (copied from Fer.). REEVE, Conch. Icon., f. 194. 



The fine spiral sculpture and contracted umbilicus are character- 

 istic. 



H. t-ERVERlANA Grateloup. PI. 14, fig. 66. 



Shell orbicular, convex above and below, the periphery angular, 

 acute. Color pale greenish-yellow. Spire elliptical, very obtuse and 

 white at summit. Umbilicus well marked, but of moderate width, 

 violet colored inside. Aperture very oblique, oval, plainly angular, 

 the right margin dilated, white and reflexed, the columella violet. 

 Whorls of the spire 4. (Graf) 



Madagascar. 



Carocolla Terveriana, GRAT., Actes de la Soc. Linn, de Bordeaux, 

 xi, p. 404, t. 1, f. 16, 1839. PFR. Monographia i, p. 394. 



Grateloup's orginal description is translated above, and his figure 

 copied on the plate. It has not been identified by subsequent au- 

 thors. 



H. UNICOLOR Pfeiffer. PL 5, figs. 74, 75, 76. 



Shell umbilicate, depressed, acutely carinated, thin, brown, deli- 

 cately striate above, with several elevated spiral lines beneath ; spire 

 depressed-conoidal ; whorls 5, nearly plane, visibly increasing, the 

 last not descending ; base convex abruptly angular at the narrow 

 umbilicus ; aperture rhomboidal ; peristome deep brown ; margins 

 joined by a very thin callus, upper margin dilated, expanded, basal 

 ascending, straightened, the columellar margin short, dilated, half- 

 closing the, umbilicus, forming an angle where it joins the basal lip. 

 (P/r.) Alt. 16, greater diam. 32, lesser 28 mill. 



Habitat unknown. 



H. unicolor PFR., Proc. Zool. Soc. 1845, p. 64; Monographia i, p. 

 393 ; Conchylien Cabinet p. 343, t. 61, f. 1-3. REEVE, Conch. Icon., 

 f. 190. 



Differs from H. xystera in the narrower umbilicus, higher spire, 

 and number of whorls. 



Group of H. lanx Fer. ^ 



The umbilicus is broad, seen to be decussately sculptured within 

 under a lens ; the aperture is oblong or oval, upper margin scarcely 



