SMITH : SPECIES OF LAND MOI.LUSCA IN SOUTHERN ALPS. 121 



Helicigona arbustorum Linne. — From fields in many parts. 

 It is found over most of Central Europe. 



var. rudis Megerle. — Mount Faloria at 7,500 feet elevation. A 

 single example, dead, was taken near the summit, in the bed of a 

 sand-slip. .It may live on some of the inaccessible crags near by. 

 This thin variety recalls those found in the French Alps and Switzer- 

 land at high points. 



Helicigona cingulata Stud. — On the road-side walls between 

 Belluno, in Italy, and a point near 2,500 feet, towards Cortina. This 

 species appears to reach its greatest development in the lower regions, 

 on the south side of the Limestone Alps, which are naturally more 

 sheltered and warm in winter. During November I took it alive near 

 Riva, at the head of Lake Garda. It may also occur on the north 

 side of these mountains, but I am not aware of its existence there. 



Helicigona planospira Lamarck. — A characteristic species of 

 the Eastern Alps, also extending south in Italy. I found it near 

 the Austrian customhouse, on the Belluno road, at about 3,500 feet. 

 Curiously it is replaced, at a lower elevation southward, by H. 

 cingiilata ; and what is more remarkable another Helicigona, viz., 

 presli, takes its place in numbers at higher elevations. Thus we may 

 understand that in the region of the Ampezzo : — 



H. cinguiaia inhabits the base of -the Alps; 

 If. planospira principally around 3,500 feet ; 

 JJ. presli from 4,000 to 6,000 feet. 



The only one of the three that I found in company of another was 

 H. planospira. It lives, under unusually favourable conditions, on the 

 Mount Crepa cliffs with H. presli. Though the numbers are very 

 limited, the individuals, being large and strong, constitute a healthy 

 colony. 



Helicigona presli Rossm. — Roughened specimens of this 

 interesting species were taken on the aforementioned Mount Crepa, 

 in the neighbourhood of Cortina. The elevation of the cliffs, where 

 they were found, is nearly 5,000 feet above the sea. The locality, on 

 the north, is an admirable one for snails. The walls are slanting and 

 smooth, with numerous crevices, which in summer are a mass of 

 creepers. These are replaced by ferns where small springs trickle out 

 of the rocks. The composition of the latter is a mixture of lime and 

 sandstone. The whole place is sheltered by pines. H. presli was 

 also taken on the Schluderbach road at 5,500 feet. Dead were seen 

 higher at 6,000 feet. Small examples were taken in the Ampezzo 

 Valley at 4,000 feet. 



Helix pomatia Linne. — Rather uncommon in the Ampezzo. 



