HELIX-IBERUS. 233 



H. SCABRIUSCULA var. VERRUCOSA Monterosato. PI. 26, figs. 39, 

 40. 



A local form, of which Kobelt's figures are copied. 



Near Sciacca, Southern coast of Sicily. 



H. (Iberus) verrucosa MONTS. MSS., KOBELT, Rossm. Icon. n. f. 

 iv, p. 73, f. 647. 



H. NADORRICA Westerlund. PI. 26, figs. 28, 29. 



Shell depressed-trochoidal or inflated-lenticular; acutely keeled, 

 umbilicus wholly concealed ; spire low conical, the apex rather 

 minute, smooth, somewhat mamillar and projecting; solid; nearly 

 lusterless, closely ribbed-striate, the ribs occasionally bifurcating, the 

 interstices malleated ; on the base the sculpture is somewhat vermic- 

 ulate. Greyish-white with indistinct bauds and spots of darker 

 color appearing in the interstices. Whorls 5, in creasing slowly and 

 regularly, and separated by a linear suture which is somewhat deeply 

 impressed toward the aperture, and is rendered more prominent by 

 the projecting keel. The upper whorls are smooth and rounded, the 

 middle have an acute keel and are impressed above it, the last whorl 

 is inflated, well rounded above and below, with acute compressed 

 central keel; more inflated behind the aperture, and at the aperture 

 somewhat constricted, suddenly and deeply deflected. The aperture 

 is very oblique, ovate, with a sharp angle outwardly, the peristome 

 being channelled there; the throat is chestnut-brown; peristome 

 acute, having a yellowish-brown thickening within ; the margins con- 

 verge slowly and are connected by a thin light brown callus ; the 

 upper margin is simply arcuate, produced forward ; the basal mar- 

 gin reflected, arcuately ascending, the concavity occupied by an 

 acute, compressed, truncated fold ; eolumellar margin dilated at inser- 

 tion, appressed, having a chestnut-brown umbilical spot. (Kob.~) 



Alt. 12*, diam. 19 mill. 



Sciacca and Nadorra, South coast of Sicily. 



H. bulowi var. nadorrica WESTERL., Fauna, p. 371. KOBELT, 

 Rossm. Icon. n. f. iv, p. 73. H. tumidosa Monts. MSS., KOB., ibid., 

 p. 72, f. 646. 



Distinguished from H. paciniana by the more convex whorls and 

 greater smoothness. Westerlund considers it a form of H. buelowi. 



Group of H. sultana. 



This group of keeled Iberus is closely allied on one side to H. gualte- 

 riana of Spain, on the other to the extensive group of H. scabriuscula, 



