HELIX-AMPELITA. 31 



last somewhat convex beneath, carinated, the carina obtuse ; aper- 

 ture irregular, quadrangular ; columella sub-calloused ; peristome 

 Tiolet-white ; lip reflexed. Diam. 30 mill. (Petit.) 



Island of St. Marie, near Madagascar. 



H. guillaini PETIT DE LA SAUSSAYE, Journ. de Conch yl. 1850, p. 

 169, t. 7, f. 3. PFR. Monographia Hel. Viv. iii, p. 352. (Not H. 

 guillaini Pet., PFEIFFER, Monogr. iv, p. 3Q2,=cazenavetti F. & B.) 



Very imperfectly described. 



H. CHLOROZONA Grateloup. PL 4, figs. 56, 57. 



Shell umbi Heated, conoid-semiglobose, rather solid, obliquely 

 :striate, a little shining, reddish-chestnut colored with three buff or 

 white zones ; spire conoidal, obtuse ; suture bordered by a broad 

 white band ; whorls nearly 5, almost plane, the last obtusely 

 angular, not descending in front ; base convex ; umbilicus funnel- 

 . shaped, pervious ; aperture oblique, truncate-oval ; peristome simple, 

 narrowly expanded, the margins somewhat converging, columellar 

 margin much dilated above. (Pfr.) 



Alt. 17, greater diam. 31, lesser 26 mill. 



Madagascar. 



H. chlorozona GRAT., in Actes Soc. Linn. Bord. xi, p. 409, t. 1, f. 

 4. PFR. Monogr. i, p. 331 ; iii, p. 225 ; iv, p. 263 ; Conchyl. Cab., 

 p. 421, t. 148, f. 21, 22. REEVE, Conch. Icon., f. 563. 



H. VESCONIS Morelet. PL 4, figs. 53, 54, 55. 



Shell umbilicate, orbicular-convex, solid, obliquely striate, red- 

 dish-chestnut, little shining, encircled by 3 whitish zones, one at the 

 suture, the other median, the third around the umbilical region ; 

 umbilicus moderate, pervious ; whorls 5, regularly increasing, the 

 last more striate ; base convex, descending in front ; aperture ob- 

 lique, oval, concolored within ; peristome slightly thickened, mar- 

 gins subconverging, the upper nearly straight, columellar more 

 arcuate', narrowly reflexed. (Mor.~) 



Alt. 20, greater diam. 30, lesser 25 mill. 



' Port Leven, Madagascar at the foot of trees. 



H. vesconis Morlt. Rev. Zool., p. 218, 1851 ; Series Conchyl. ii, p. 

 49, t. 4, f. 5. PFEIFFER, Monographia iii, p. 225. 



Less globose than H. chlorozona, more inflated transversely, pro- 

 ducing a broader aperture ; umbilicus narrow-er ; peristome more 

 reflexed ; last whorl with stronger striae above. The two forms are 

 nevertheless very closely allied, perhaps not separable specifically. 



