Semilimax elongata 

 Vitrea diaphana 

 » subrimata 

 » crystallina 

 l'olita pura v. lenticularis 



» blauneri 

 Punctura * pygmaeum 

 Patula rupestris 

 Achantinula aculeata 

 Frutticola ancona v. rubella 

 » cemenelea /. minor 



» orsinii 



Campyltea plariospira 



» cingulata v. Iucensis 



» preslii v. anconao 

 Arianta arbustorum 

 Xeropbila virgata v. variabilis 



» ammonis v. bononiensis 

 Pornatia cincta 

 Zebrinus detritus 

 Lauria sempronii 

 Torquilla similis 



» boauleisiana 

 Isthmia * minutissima 

 Sphyradiura edentula 

 Alaea * pygmsea 

 Vertigo * angustior 

 Clausìliastra laminata v. targionii 

 » » v. major 



» >> v. cyanea 



» Iucensis 



217 — 



Clausiliastra interposita 

 Delima itala v. rugata 



» » v. plambea 



Kuzmieia rugosa v. pinii 



» delpretiana 



» cruciata s. v. minor 



» » v. apuana 



» » v. triplicata 



Pirostorna plicatula 



» » v. superflua 



» » v. minor 



Rumina decollata 

 Ampbibina * pfeifferi 

 Carycbium * minimum 



» * tridentatum 



Planorbis * spirorbis v. tiberii 



» * albus 

 Ancylastrum * costatimi 

 Acicula lineata 



» elegantissima 

 Auritus montauus 

 Bythinella opaca 



« » v. siemoniana 



Pseudamnicola macrostoma 

 Calyculina * lacustris 



» brochoniana v. steini 



Flumina * amnica 

 Possarina casertana 



» obtusalis 



Euanodonta * cygnea 



d) Specie comuni alla pianura delle due regioni. 



Fruticicola strigella 

 Pomatia lucorum 

 Isthmia minutissima 

 Gulnaria auricularia 



Gulnaria ovata 



Tropidiscus corneus v. etruscus? 



» umbilicatus 



» » v. submar&'inatus. 



e) Specie della pianura piemontese. 



Aegospina * olivetorum 

 Phenacolimax * nellucila 



Xeropbila *introducta 

 Anodonta rossmàssleriana 



