204 HELIX. 



Var. PACINIANA Philippi. PL 55, figs. 36-38. 



Rather thin, coarsely sculptured with white anastomosing wrinkles; 

 columella concave, not callous; keel becoming obtuse or obsolete 

 toward the aperture. Diam. 16 mill. 



H. vieta Rossrn. (pi. 62, figs. 32-34.) is synonymous. 



There is a forma major, measuring 20 mill. diam. (pi. 55, fig. 34, 

 35). This form may be distinct from scabriuscula; the specimens 

 before me have a more distinct aspect than the other varieties. 



Var. EXPLANATA Benoit. PL 62, fig. 31. 



Half-covered perforate; spire planate ; whorls above subconcave, 

 exserted at the carina, the last very turgid beneath. 



Var. DEMISSA Benoit. 



Small, subperforate, striate, spire subplane, whorls a trifle exserted 

 at carina. 



Var. DREPANENSIS Huet. PL 62, figs. 26, 27. 



.Small, elate-turrited, whorls scalariform, acutely keeled, sculpture 

 of coarse white wrinkles on a livid ground. 



Var. scalariformis Ben. is a synonym. 



H. SARDONIA Martens, 1884. Unfigured. 



Perforate, carinate, depressed, rugose-striate, whitish, maculate 

 with brown above, with a single interrupted band below; spire 

 slightly prominent; whorls 4, above flattened, with a more or less 

 exserted carina, the last rather convex below, distinctly descending 

 anteriorly; aperture very oblique, axe-shaped ; peristome white, mar- 

 gins approximating, the upper expanded, the basal reflexed, concave, 

 arcuate, partly covering the perforation. (Martcm*.) 



Diam. 21, alt. 101 mill. 



Dorgali, Sardinia. 



Very similar to the Sicilian H. scabriuseula Desh. and H. segestana 

 Phil.; but the rib-striae are finer and more regular, the columellal 

 margin more strongly concave. In the intensity of the brown mark- 

 ings, which generally are above arranged into two interrupted bands, 

 the covering of the umbilicus by the peristome (i1), the exsertion 

 of the keel of each succeeding whorl, and the absolute size, there is 

 great variation among various specimens. (Martens.^ 



The above descriptions and comments, translated from v. Martens, 

 contain all the information published regarding this species, which 

 is, apparently, quite distinct. 



