IIKI-IX. 



The synonyms are H. terrettfri* Forsk., neritoides Chemn., naticoi- 

 des Drap., karalitana Prunn (tests Villa). 



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

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

 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, 184."). PI. (is, fig. 13,14. 



Im perforate, globose-conic, thin and light, olivaceous yellow, five- 

 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 synonymous. 



Connects H. apertu with the typical group of Pomatia. 



H. AGGERIVA<;A Mabille, (Guide Nat. 1880, No. 3.) Uii figured. 



Corsica. 



The description of this species, said to be intermediate between 

 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. li(/</f<t /t 

 lucorum, in Miseellanees Italo malacologiques. He says: "Jeconnais 

 162 especes d'Helix du groupe des Pnntatiu. 8ur les 162 espei-es, j'en 

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

 And then folio svs a classification of the group into "deux grande* 

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

 Binnenconch., who admits but thirty-three species! 



The following names are from "Miseellanees Italo-malacologiques," 

 J. R. Bourguignat, 1883. 



