198 HELIX. 



H. EXORNATA Deshayes. PI. 51, figs. 13, 14. 



Subglobose, somewhat depressed, smooth, pale yellow, with white 

 zones, ornamented with two black undulate-angular zones at the 

 periphery ; spire short, obtuse, convex : whorls 4, slightly convex, 

 wide, rapidly increasing, the last large, convex, slightly depressed 

 below, imperforate, obliquely deflexed at the aperture ; aperture 

 large, oblique, rotund-lunar ; peristome white or yellow, thickened 

 within, reflexed, the base marked with a wide rosy spot. 



Diaui. 14, alt. 10 mill. 



Habitat unknown. 



This form is known only by the description of Deshayes which is 

 translated above, and the original figures, copied on my plate. I 

 follow Pfeiffer in referring it to Leptaxis; but of course any subgen- 

 eric reference, without more information than we possess regarding 

 it, is little better than guess-work. 



(B. Species with carinate periphery.^) 



H. CHRYSOMELA Pfr., 1848. PI. 51, figs. 50-52. 



Imperforate, depressed, destitute of cuticle, chalky white, with 

 wrinkles of increment, rugose, malleated; whorls 5, flattened, grad- 

 ually increasing, the last angled at its origin, becoming almost round- 

 ed, very briefly but abruptly descending anteriorly ; aperture very 

 oblique, slightly contracted, truncate-oval, the upper and lower mar- 

 gins subparallel, peristome reddish orange colored; columellar mar- 

 gin very obliquely descending, broad, straight within. 



Diam. 10, alt. mill. 



Quarternary of Porto Sancto. 



H. cenostoma Lowe is a synonym. 



Var. FLUCTUOSA Lowe, 1852. PI. 52, fig. 86; PL 51, tigs. 9, 10. 



This form differs from H. chrysomela in being larger, more acute- 

 ly carinated, and with whorls less rounded above. The peristome is 

 white, and is less thickened internally on the columellar margin than 

 in the type. Diam. 14 mill. 



H. VETUSTA Morelet et Drouet, 1857. PL 66, fig. 80u. 



Imperforate, conic, rather solid, cretaceous white, (or rarely varie- 

 gated with corneous) with two reddish brown bands, usually inter- 

 rupted or subobsolete, obliquely striate, and with a tendency to be 

 still more obliquely, finely undulate ; whorls 6-65, carinate in the 

 middle, slowly widening, flattened above, the last a trifle more con- 



