HELIX. 203 



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

 tion. Diam. 28, alt. 13 mill. 



-1//N. of TertiKin, Morocco. 



If. snbscabriitscula Bourg., published before iwlt<nn,t, but with nei- 

 ther description or figure, is a synonym. 



H. LEACHII Ferussac, 1821. PI. 03, figs. 26-28. 



Nearly covered perforate, carinate, convex-lenticular, sculptured 

 above and below with numerous pliciform costse, 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; peristome dilated, expanded, 

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

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



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



Tarhuna ^fts. Trij>/i. 



H. tripolitana Wood is synonymous. 



H. SCABRIUSCULA Deshaves, 1830. PL 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 J , 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 

 angled at the termination of the carina; peristome expanded, termi- 

 nations sub-converging, the basal margin frequently subdentate, 

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



Western Sid/;/. 



H. eri/cina Jan. is synonymous. 



Var. SELINUNTINA Philippi. PI. 62, figs. 28-30. 



Differs from the type in the interrupted reddish bands; carina 

 not exserted, stria? simple. 



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



Umbilicus generally slightly open; sculpture consisting of eleva- 

 ted anastomosing wrinkles; keel crenulated. 



