HELIX. 203 



straight, lower dilated, reflexed, more or less concealing the perfora- 

 tion. Diam. 28, alt. 13 mill. 



Mts. of Tertuan, Morocco. 



H. subscabriusculaHourg., published before sultana, but with nei- 

 ther description or figure, is a synonym. 



H. LEACHII Ferussac, 1821. PI. 63, figs. 26-28. 



Xearly covered perforate, car in ate, convex-lenticular, sculptured 

 above and below with numerous pliciform costa3, which are parallel 

 with the aperture, pale grayish yellow or whitish, opaque; whorls 

 4, scarcely convex, the last with a keel which becomes obtuse toward 

 the aperture, very convex below, suddenly deflexed anteriorly; aper- 

 ture very oblique, transversely subovate; peristorne dilated, expanded, 

 white, the upper and lower margins subequally curved, converging, 

 joined by a distinct shining wide callus, (v. Martens.) 



Diam. 17-19, alt. 10-12 mill. 



Tarhuna Mts. Tripoli. 



H. tripolitaini Wood is synonymous. 



H. scABRiusri-LA Deshayes, 1830. PI. 53, figs. 19-21, 14-16. 



Covered perforate or nearly so, depressed, carinated, low-conic 

 above, convex below, solid, whitish unicolored or with several spiral 

 cordons of reddish blotches, more or less strongly obliquely striate, 

 and covered with a microscopic granulation; whorls 4-4-1, moderately 

 increasing, flattened on the upper surface, with a compressed exserted 

 median keel ; body-whorl gibbous below, rather suddenly and deeply 

 deflexed anteriorly; aperture oblique, transversely oval, acutely 

 aiiii'led at the termination of the carina; peristome expanded, termi- 

 uations sub-converging, the basal margin frequently subdentate, 

 appressed over the umbilical perforation. Diam. 24, alt. 10 mill. 



Western Sicily. 



H. erycuKt .Jan. is synonymous. 



Var. si: LIXI-NTINA Philippi. PI. 62, figs. 28-30. 



Differs from the type in the interrupted reddish bands; carina 

 IK it exserted, striae simple. 



Var. SEGESTANA Philippi. PI. 53, figs. 1-5, 17, 18. 



Umbilicus generally slightly open ; sculpture consisting of eleva- 

 u-d anastomosing wrinkles; keel crenulated. 



