58 HELICID. 
Scotland than on the west. I have frequently taken it in 
ants’ nests under stones. ‘The variety is not uncommon. 
At Beaumaris, where it is abundant, I found compara- 
tively few individuals of the type, and the same remark 
applies to Northamptonshire. 
Var. costéta (Miull.). Marked in line of growth with 
epidermal ribs. 
Sub-genus.—CHILOTREMA Leach, 
7, H. LAPIC{DA (stone-cutter) Linné. Pl. IV., f. 4. 
Circular, compressed, dark rufous brown, dull, semi-transparent ; 
whorls 5 ; mouth obliquely oval, surrounded by a strong white re- 
flected rim; very strongly carinated ; zmzdzlicus large. A. 65mm. 
B. 165mm. 
This strikingly formed shell is found in many parts of 
England, as far north as Yorkshire, rarely in Wales, and 
not at all in Ireland. Its only Scottish habitat at Hawick 
has been destroyed. It occurs chiefly in calcareous 
districts, but not exclusively; it is fairly common at 
Maidenhead (Berks), where the soil is gravelly, and at 
other places where limestone is not present. 
The name ‘stone-cutter’ is due to its supposed habit 
of boring into rocks. This idea is, of course, erroneous, 
but it does ensconce itself in crevices of rocks, whence it 
emerges after rain. The white form is very rare. I once 
took a single specimen at Ewell near Dover, on the trunk 
of a birch tree. In the same spot I have taken two 
scalariform specimens. 
Var. I. albina (Menke). White. 
