HELIX. 



The synonyms are H. terrestris Forsk., neritoides Chemn., naticoi- 

 des Drap., karalitana Prunn (teste Villa ). 



A common species, easily recognized by its bubble-like form and 

 large aperture; the epiphragm is calcareous, white, very convex, 

 as if inflated from within (as, indeed, it is), and situated at the edge 

 of the aperture; the animal is deep black in color, the central region 

 of the foot below lighter. 



H. TRISTIS Pfeiffer, 1845. PL 68, fig. 13,14. 



I m perforate, globose-conic, thin and light, olivaceous yellow, tivc- 

 fasciate with dark chestnut, densely obliquely striate and finely 

 decussated by spiral impressed lines, especially above ; spire short, 

 conoid, apex rather large and very obtuse ; sutures well impressed ; 

 whorls 4, slightly convex, the first rather large, the last large, inflated, 

 indented at the axis, a little deflected anteriorly ; aperture oval- 

 lunate ; peristome simple, very slightly thickened, outer, basal and 

 columellar margins regularly arcuate, the latter narrowly reflexed 

 and adnate over the umbilical perforation. 



Diam. 20, alt. 18-22 mill. 



Corsica. 



H. ceratina Shutt. is synoi^rnoiis. 



Connects H. aperta with the typical group of Pornatia. 



H. AGGERIVAGA Mabille, (Guide Nat. 1880, No. 3.) Unfigured. 



Corsica. 



The description of this species, said to be intermediate between 

 aperta and aspersa, is not accessible to me. 



*** 



The following species are unknown to me ; and are probably, for 

 for the greater part, spurious. The manner of species-splitting 

 indulged in by the "nouvelle ecole" conchologists is shown in the 

 following remarks of M. Bourguignat, prefatory to his Description 

 de quelques especes italo-pomatiennes de la serie des H. ligata et 

 lucorum, in Miscellanees Halo malacologiqaes. He says: "Je connais 

 162 especes d'Helix du groupe des Pomatia. Sur les 162 especes, jVn 

 possede 151. Onze seulement manquent a ma collection." etc., etc. 

 And then follows a classification of the group into "deux grand <> 

 sections and nineteen series of species. Compare Kobelt, Cat. cur. 

 Binnenconch., who admits but thirty-three species! 



The following names are from "Misce/t<in<'es Italo-malacologiques" 

 J. R. Bourguignat, 1883. 





